drink water dry mouth phentermine

Although phentermine will suppress your appetite and boost your energy levels, making it easier to eat healthy and exercise more, it can also produce negative side effects. While you’re on your weight loss journey, it can be difficult enough to focus on your goals without having the extra problems of symptoms, such as insomnia, a dry mouth and dizziness. However, many of these phentermine side effects often pass after a few days or weeks, and, in the meantime, we have some tips for you on how to relieve these side effects while still focusing on working towards your weight loss goals.

1. Dry Mouth

This is probably the number one phentermine side effect, and while it may not sound too uncomfortable, those who have experienced it will probably tell you a different story. Often it is an uncomfortable sensation with an almost insatiable thirst, and can even lead to mouth ulcers and sore gums. The best way to combat this is to drink a lot of water with Phen Drink added to improve taste and really get your mouth back to normal. Always keep a bottle with you and take regular sips from it to keep yourself hydrated, aiming for a daily total of 64 oz, which is around 8 glasses. You should also cut down on coffee and alcohol consumption, as both are diuretics and can leave your mouth feeling even drier.

As well as drinking plenty of water, you should eat more fruit and vegetables with a high water content, such as cucumber, celery, watermelon, and grapefruit. Snacking on these will help stimulate your saliva glands and add moisture to your mouth while also keeping hunger at bay. Our taste buds can also become inhibited by a dry mouth, so a great way to combat both is to sprinkle cayenne pepper on your food; this spice acts as nature’s wake-up call, helping to stimulate your salivary glands, tantalize your taste buds and boost your metabolism!

2. Insomnia

Phentermine is a stimulant, and for this reason it can cause those who take it to have insomnia. Getting a good night’s sleep is crucial for maintaining a healthy body and mind, and when you’re trying to lose weight, a lack of sleep can also have adverse effects on your best efforts to slim down. Lack of sleep makes you more susceptible to stress and depletes your energy levels, both of which cause us to crave unhealthy foods and make bad food choices.

If you’re having trouble sleeping, it’s a great idea to wind down before going to bed. A warm bath can really help to relax you, as can a soothing massage on the pressure points of your neck and back. Create a relaxing atmosphere with some calming music and drink a glass of warm milk or a cup of herbal tea, such as chamomile, to help you de-stress. Steer clear of caffeine as much as possible, especially later in the day. You should remove stressors from your bedroom and avoid working or watching TV in there, plus make sure that your bedroom and your bed are comfortable and at the right temperature for you – a lumpy mattress, cold feet or heavy, hot blankets can inhibit sleep and are easily fixed.

3. Constipation

If you feel constipated while taking phentermine, you should increase your water intake as it’s the best liquid for washing away waste and toxins in the body. Other drinks such as juice and soda can’t compare, as their high sugar levels can actually make constipation worse. You should avoid fats and refined sugar, and although caffeine can be considered a quick fix for constipation, it is also a diuretic, meaning that it takes moisture out of stools, making them harder to pass – for this reason you should stay away from coffee, cola and alcohol. If you’re also experiencing bloating as a result of constipation, you should avoid sodium and artificial sweeteners.

You should aim to increase your fiber intake by eating high-fiber foods such as whole grain bread and cereal, beans, fruit, and vegetables. Prunes are especially good, as they contain sorbitol, a stool-loosening sugar that naturally helps relieve constipation. Exercise is another way to promote healthy bowel movements, and while moderate to rigorous physical exercise is preferred, just going for a quick walk around the block will help.

migraine phentermine side effect

4. Dizziness

To combat the phentermine side effects of dizziness, make sure you’re drinking lots of water, as dizziness is often caused by dehydration. For this reason, you should also avoid caffeine and cut back on salt, as both can cause you to become more dehydrated.

Dizziness can be as a result of a lack of food, so make sure you’re eating enough – remember that 1,200 calories is the minimum anyone should go to while dieting, but if you’re heavier to start with, male or very tall, you should probably be eating more than this. An imbalance in your blood sugar levels can also cause you to feel light-headed, so try eating five small meals throughout the day to keep these levels steady, your appetite satisfied and your metabolism running smoothly. More specifically, your diet may be lacking in iron so try to include iron-rich food, such as red meat, eggs, dark leafy greens and fortified cereals. Iron is absorbed into the body better when combined with vitamin C, so try eating these iron-rich foods with foods high in vitamin C, such as red peppers, kiwis, and broccoli.

5. Nausea

If you are feeling nauseous as a result of taking phentermine, firstly you should stick to drinking clear liquid such as water, as it is easier for your stomach to take and it will prevent dehydration. Nausea can also occur as a result of hunger, so if you know you haven’t eaten enough that day, try to eat something dry, like toasted whole wheat bread. Ginger is a great remedy for relieving nausea; studies have shown that it’s better than any anti-sickness medications you can buy at the pharmacy, so have some ginger tea or gingersnaps if you’re feeling nauseous. Mint tea also helps – the best way to make it is by adding a tablespoon of dry mint leaves to a pint of boiling water, leave it for about 30 minutes, then strain the tea and drink it.

These tips should help you to relieve the main phentermine side effects, which some people can suffer from as a result of taking phentermine. However, if these symptoms persist, or if they become particularly difficult to deal with, you must consult your phentermine doctor as soon as possible. If you are unable to continue taking phentermine due to the negative side effects, but still feel you could benefit from taking a weight loss supplement, Phen Caps are an ideal alternative as they provide the same appetite suppression and energy boost as phentermine, but have no known side effects.

We would love to hear from you if you have any comments or feedback about these tips for relieving the side effects of phentermine, or if you have any tips of your own that have worked for you, so please comment below!

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129 Responses

  1. I seem to get headaches from Phentermine. I only take half of the dosage per day…any feed back ?

  2. I have been taking 37.5 mg once every morning for8days now. I have very bad dry mouth..all day and all night. I smoke cigarettes and it increases my desire for a cigarette immensely. I went from smoking one pack every 4 days to one pack every day. I haven’t been eating consistently because im on the go constantly on this medication that sometimes I cant remember when the last time I ate was. Tomorrow I will buy a journal and record everything. I am assuming I havent lost any weight yet because I havent been eating right so probably when I finally do eat my body immediately stores it as fat. I have yet to weigh myself though. I started on 2/13 at 218 lbs. I like the feeling it gives me…like energy to be active and it stops me from constantly obssessing and craving food allllll dayyy. But every time I eat something now (and it is a small portion every time) I am fine until maybe an hour or so after I finish. Then my stomach begins to make loudddd noises and I can feel the food I just ate digesting and moving through my intestines! It is so uncomfortable, and really loud! This lasts for an hour or more! I have never had this problem ever in my life….and I used to overeat until I could feel the skin on my stomach ripping into deep red stretch marks! And even then I never felt such uncomfortable digesting. What is this and is there anyone else who is experiencing it???

  3. What Id do is start drinking more water! I dunno if it’ll help or not but is try it

  4. I have been getting extremely dizzy. Couldnt figure out if it was this new nyc lifestyle, fast paced, not eating regularly, not drinking enough water… so I got off of them and ate regularly and drank water and symptoms seemed to fade. I got back on the pills a couple of days ago and what do ya know, fell completely dizzy all day today. I was very worried I would fall..

  5. I started out almost a month ago on Phenterrmine weighing 214lbs. I have done fine til yesterday and my stomach felt nauseated, so I ate. Now this is the next day and that same feeling is there. I have had water and some crackers and an egg. The scales now say 202. So the weight or water one is coming off. But, I don\’t like stomach feeling like this. Any ideas?

    • Hi Karen, nausea is generally a side effect that starts with the phentermine but then goes away after a few days or weeks. The fact that it has started late might indicate it is more related to what you’re eating or that perhaps you’re not eating enough. Are you eating at least 1200 calories per day and making sure to get regular meals with healthy carbs, protein, fruit and veg?
      Sally, phentermine.com

      • I just started Phentermine today. How long should this nausea last? I just feel sick at the stomach.

        • Hi Tina,
          Nausea is a common side effect but it generally only lasts the first few days. Nausea is usually related to food or a lack of it, so it might be a good idea to eat sooner after taking phentermine, because, while your body is getting used to it, the wait of an hour or two before breakfast can really irritate the stomach and cause this nausea. Hope that helps!
          Sally, phentermine.com

  6. I have been taking phetemine 37.5 and I have recently started to develop a ache pain in my chest? Is this normal

    • Hi Charlotte,
      This is not a common side effect but it could be serious, you should talk to your doctor as soon as possible.
      Sally, phentermine.com

      • Charlotte, I also had a dull pain in the center of my chest for a few days. I’m unable to determine why I had it, however, to my understanding, phentermine has made me be bloated and have gas so I burp. This burping could strain the chest muscles. It’s a theory for both of us, but still don’t know. My previous ekg came out normal. Monitor your blood pressure and Do Not drink coffee close to taking phentermine.

  7. Thanks Sally, My sister in law has also been taking them
    And had the same effect on her after week and half , i have been taking them for only 8 days but over 2 weeks where I have had a few days break in between and haven’t had a appetite at all but falsed myself to eat where I have been feeling slightly weak and lack of energy when it hits the afternoon, I’ve probley had about 6000 cals in the space of two weeks which I know is bad but I just have no interest in food. So far I’ve Lost 12 pounds which I first started at 12.12 not weigh 12stone. I don’t think it helps I have been drinking energy drink which is one a day of a morning and maybe 1-2 zero coke a day as well.. Do u think the caffeine is maybe the problem, where it’s an over load of caffeine and the tablet combined x

    • Hi Charlotte,
      Energy drinks and diet sodas are very bad for your body and don’t help with your weight loss efforts either. Energy drinks have been known to cause heart problems too so this could definitely be a factor. But, I think the main issue here is that you should have more of an appetite by now. I would recommend that you halve your dosage by splitting your tablet in two and just take half for a few days to see how you feel. And, if you can’t face food at first then perhaps you could try making your own smoothies? My personal favorite is pineapple juice, frozen berries and a Greek yogurt, so you get fiber, protein and a much healthier energy boost too.
      Hope that helps!
      Sally

  8. I have phentermine for 2 moths now I lost 20 pounds but my skin is dry and in my face I star ed to have like beads face and I already use creams but don\’t help…please if some body can help me to remove my beads face

    • Hey Jhon,
      I haven’t been able to find ‘beads face’ in an online search, is it a typing error, or could you describe what this condition is so we can see if we can offer you any help or advice. Thanks!

      Sally, phentermine.com

  9. Started phen 4 days ago. The first day I didn’t eat much so I felt horrible! I’m real sensitive to pills.. It got better after that but night before last, I almost dosed off but immediately had to sit up cuz it was just a rush of dizziness. Then this morning it was terrible! It’s ONLY when I roll over to my left side. Is it normal to get dizzy on just one side??

    • Hi Brea,
      Dizziness is a common phentermine side effect but I’ve never heard of people describing a dizziness only on one side. Is it possible that you have an inner ear imbalance or an ear infection or something?
      Sally, phentermine.com

  10. I just started taking 30mg Phentermine 5 days ago and it makes me feels horrible. I get an upset stomach, dizziness and hot flashes. I try to eat to see if that\’ll make me feel better, but I have absolutely no taste for food. What should I do?

    • Hi Latoya,
      Regardless of whether you have taste for food you have to eat as an empty stomach will only make the side effects harder to bear, and you also will find it hard to lose weight as your metabolism will slow down if you don’t eat enough. Drink lots of water and eat what you can eat, whether it’s a yogurt or some toast or a smoothie – like when you’re sick there should be something which you think you can manage and then take it from there. And, it could also be a good idea to split your dosage if you’re taking it in tablet form as this can make the first few days easier to bear until your body gets used to the side effects a little more.
      Sally, phentermine.com

  11. Been taking phentermine for over a month a month now and for the past week i have been getting light headed is this a normal side effect? Also have began exercising. And it just seems to come and go throuout the day

    • Hi Martin,
      Yes, feeling light-headed is a normal side effect. You should be sure to drink plenty of water, especially when exercising, and try to eat every couple of hours even if it’s just a small snack like a handful of nuts or a piece of fruit to keep your blood sugar levels steady. Feeling light-headed can also be due to low blood pressure, so if you have that already then you might be more likely to experience light-headedness with phentermine. A salty snack like some wholegrain crackers or some salted peanuts can help with this.
      Hope that helps!
      Sally, phentermine.com

  12. My only complaint is that towards the end of the day, i get such terrible migraines that i vomit. It only lasts for the first couple days when i begin taking them, but this makes me nervous about starting back up again, especially since im starting a new job in 5 days…

  13. I have been taking phentermine for a week now and I started feeling nauseous and dizzy three days ago, today it’s currently unbearable. Is this normal? I drink 3 cups of water had toast and lunch. I feel like I have to throw up. I usually have half of a pill but I figure I could start taking a whole one What should I do?

    • Hi April,
      If the side effects of phentermine are ‘unbearable’ as you say, this is a warning sign that there is something in them that is not agreeing with your body. You should speak to your doctor as soon as you can, but if you’re not able to get in touch with him or her then you should stop taking phentermine and wait to speak to him/her when you can. If half a pill is having this effect on you then you really shouldn’t increase your dosage.
      Sally, phentermine.com

  14. Hi, I’ve been taking 1/2 tab for a week. I’m still nauseous, especially when I work out. I’m eating and drinking plenty of water. Does this usually subside?

    • Hi Gina,
      Usually the nausea side effect does subside, but since you’re particularly affected when you exercise then it may be that you’re not eating the right foods and amount before you work out. This guide should help you get the right exercise fuel: http://www.phentermine.com/blog/workout-snacks-phentermine-weight-loss/ With respect to the nausea, if it doesn’t subside within another week then we would advise you to speak to your doctor.
      Sally, phentermine.com

  15. I’ve been taking Phentermine 37.5 for about 6 months with my family dr supervision (monthly appointments). Everything has been great. I’ve lost a lot of weight and feel great. The last few weeks I have been feeling nauseous. It starts in the morning as soon as I start moving around. It will go away and come back throughout the day. I think it is because I have lost interest in food. I don’t think I am eating enough. I can’t have carbs/gluten due to other issues. Any suggestions?

    • Hi Val,
      Yes it definitely sounds like this nausea is because you’re not eating enough – you need to eat at least 1200 calories a day of healthy nutritious food, hungry or not. Phentermine is an aggressive medication, so if you’re taking it and eating very little then your body will react in this way. If you can’t have gluten because you’re celiac then you can still have carbs but just without gluten – carbohydrates are an essential part of our diet and provide energy for our bodies and brains. If you’re not celiac or don’t have a diagnosed intolerance then there is no reason you shouldn’t eat gluten – there is nothing in gluten that is bad for the average person. This article explains more: http://www.phen.com/how-to-lose-weight-phen-blog/what-is-gluten-should-i-avoid-it
      Sally, phentermine.com

  16. I been taking phen for over a month and it makes me hungry and I get up and go in the morning but am overtired around four in the evening I drink tons of water everyday all day cause I don’t wanna eat so much any advice for me

    • Hi Miriam,
      It sounds like phentermine really isn’t working for you if it makes you hungry and tired. We would advise you to speak to your doctor to find out if there is anything else that might work better for you.
      Sally, phentermine.com

      • I started taking 30 mg 4 days ago. and I am experiencing the same feeling of hunger and if I don’t eat the weaker and the more tired I get and as soon as I eat I am fine for about an hour if that. Watch me gain weight on this lol

        • Hi Diana,
          If you think that phentermine is actually increasing your appetite then you should talk to your doctor – it could be that the dosage is too strong for you or just that phentermine isn’t suitable for you.
          Sally, phentermine.com

  17. I started taking phentermine Dec 24, 2014 i took it until February of 2015 lost 29lbs I had absolutely no side effects. My doctor prescribed it to me again Dec 31, 2015 and this past week I’ve been feeling nauseous, light headed, and headaches the symptoms occur off and on throughout the day. I really like the results that it gives me, but the side effects 🙁 What should I do???

    • Hi Deedee,
      It can happen this way that phentermine has no side effects and then another time it does, so this is quite common with many of our forum users etc. If you’re on high dosage such as 37.5mg and taking the tablets then you could try halving them to help your body get used to the phentermine more slowly, and then increase your dosage after a week or so. Otherwise, it could be that you’re not eating enough or not drinking enough water so be sure to have regular small meals and snacks and to drink plenty of water throughout the day.
      Sally, phentermine.com

  18. 250 lbs November 15, 2015. Presently January 2, 2016 225 lbs. I’m very pleased with my weight loss. Good is not my focus any longer. For the first time in my life, I plan what I’m going to eat. Since I’m not hungry, I have to plan meals so I will eat. In 2008 at my peak weight of 330 lbs size 26-28, I underwent gastric bypass and lost 136 lbs in six months. I was at 194 lbs wearing a size 12. I was very happy. Seven yrs later gaining 56 lbs I was upset with myself for letting that happen. Phentermine is helping me gain control over food. I only eat when I need to, breakfast, lunch then dinner. Light meals, because once again I’m not hungry. I’m only eating because I need to. My main side effect is dry mouth with mouth ulcers. I can deal with that. I’m drinking water like crazy. A good thing. Instead of buying new clothes, I’ve been taking them in with the swing machine. I’m wearing a 14 in jeans but taking them in weekly 😆. Co-workers are asking me how I’m losing and I’m happy to tell them, it’s Phentermine.

    • That’s great Rosanna, we’re really pleased for you, WELL DONE!!!
      Sally, phentermine.com

  19. I started taking phentermine 1/2 a pill but i feel very dizzy, is there something i can do to not feel this way?

    • Hi Maria,
      Yes, you can help to ease this symptom by being sure to drink lots of water, cut down on salt and caffeine, eat every 2-3 hours and get plenty of foods rich in iron and vitamin C.
      Sally, phentermine.com

  20. I have been taking phenteine for about 3 weeks. I starting to have numbness mainly on my right side in my arms, legs, and feet. Sometimes it is on the left side but it is mainly in the right. The numbness and tingling comes and goes but it had been on and off for the past week. I have also had numbness in my face. Is this a normal side effer t or should I be worried?

    • Hi Pam,
      Numbness isn’t listed as a side effect of phentermine but it does sound like it could be related and potentially serious. We would therefore recommend that you speak to your doctor as soon as possible as this is not something which can be ignored. Best of luck.
      Sally, phentermine.com

  21. I started taking Phentermine 37.5 a couple days ago and the only side effect I have other than a slightly zoned out feeling is irritability, I have found that I become very short tempered around 3 o’clock. Is there anything I can do to combat this?

    • Hi Jessica,
      Side effects like irritability are quite common with phentermine as it has the effect on the body of amplifying emotions, both good and bad. As you seem to experience this particular feeling more around 3pm, it could be a good idea to prepare yourself for it mentally around 10-20 minutes before, by taking some time out to employ one of these stress management techniques: http://www.phentermine.com/blog/de-stress-for-phentermine-weight-loss-success/ If you’re working it might be more difficult, but a quick 5 minutes to yourself away from the stresses of everyday life should at least reduce this side effect for you until your body adjusts to the changes caused by phentermine. Hope that helps!
      Sall,y phentermine.com

  22. Hi there,

    I have been on and off phentermine for a couple of years (under supervision of my endocrinologist). The last batch I received made me very sick to my stomach – dry heaving, the whole nine yards – it was so bad I thought I was pregnant and experiencing morning sickness! This is not something I’ve experienced before and the brand has not changed.

    Do you know if perhaps the formulation has changed and this could contribute to this issue? The brand my pharmacy uses is KVK Tech Inc, 37.5 mg.

    After the first Rx (four years ago), I lost 40 pounds almost immediately however I am not losing weight on it any longer, which is frustrating. It’s preventing me from gaining weight however, so my endo is happy with continuing the Rx. (I have been off for periods of time, usually six months)

    Have you experience someone who had not lost weight? Any clue what I might be doing wrong?

    Thanks
    Chris

  23. I started take Phentermine 4 days ago. My Dr. has me doing 30 days of HMR 800 supplement shakes 5 times a day instead of food. I have better very dizzy, irritable & nauseous. I’m wondering if the supplement shakes aren’t providing the nourishment my body needs while on the phentermine.

    • Hi Trisha,
      We wouldn’t recommend supplement shakes while taking phentermine. As you say, they probably aren’t providing the nourishment your body needs, and when you’re taking an aggressive drug like phentermine, this is only going to make the side effects affect you more. In addition, this kind of plan deprives you of the opportunity to develop healthy eating habits, which is the key to long-term goal weight maintenance. Our advice would be to speak to your doctor and see if he or she has an alternative plan for you which involves healthy balanced meals instead of these shakes.
      Sally, phentermine.com

  24. Sensation of cold feet it is driving me nuts – I stopped the phen four days ago to see if it stops. I went to the doc and my pulse and circulation is fine.
    Help! Anyone dealing with this?

  25. Hi Good morning people. I have taken phentermine in the past about 6 years ago. I did loose weight and now back on them to try and shed a few pounds. One bad thing….I’m hating the side effects!!! I am very moody and emotional and pick fights with my boyfriend and have a bad crash. Does anyone have these bipolar side effects with phentermine 37.5? If so what can I do to help stabilize myself while taking them??Help!

  26. Hi I have been taking this for 2 days. The first day I took a quarter of the pill. Although it made me feel high And ate less. By the evening I was hungry and I had insomnia. The next day I took a half a pill. Wow it felt great and I didn’t really eat much but by night I was feeling sick and. Although I was tired. I could not sleep. Is this normal. Can I just take a quarter and that be enough. I don’t want to feel sick and I sort of feel palpitations. Any suggestions? Oh yea. My dry mouth is annoying. I tried adding lemon to my water for the quench. Didn’t work.

    • Hi Samia,
      If a quarter works for you then this is fine, especially to start off with – many people find that a whole pill is too much at first, but within a few days they find that they can take a whole pill without problems. In your case it sounds like you’re a little more sensitive, but there is no reason why you should take a higher dosage than you feel comfortable with. As for the dry mouth, we recommend Phen Drink, which includes saliva-boosters to stop the symptoms of dry mouth better than plain water can. Here’s a link to find out more: http://www.phen.com/phendrink
      Good luck!
      Sally, phentermine.com

      • Hi Sally
        Can you address the palpitations, as this is the only adverse effect I experienced at night. I began my weight loss treatment on Tues 3-29-16, for the first time I felt the palpitations last night, 4 days after beginning Phen HCL 30mg daily. I have occasional elevated pulse during the day 124-135, which I can control by staying active and controlling my breathing. I am glad I found this blog to read others concerns and your recommendations.

        • Hi Priscilla,
          An elevated heart rate is normal with phentermine, but if you experience an irregular heart beat or fluttering heart beat then you must tell your doctor immediately, as these are signs of a potential risk to your health.
          Good luck with your weight loss journey and stay safe and healthy!
          Sally, phentermine.com

  27. Hi there, I started taking phentermine on 3-25-2016, but I am still eating, it did not suppress my appetite at all, am I supposed to wait a little longer for it to start working?

    angie

    • Hi Angie,
      You should still have an appetite and want to eat, but it should be less than before. If it’s not working for you at all maybe your dosage is too low. I would advise you to speak to your doctor to see what he or she recommends.
      Sally, phentermine.com

  28. I started phen. 37.5 exactly 3 weeks ago so far I have lost 15 pounds! I’m very happy with the results so far however I do have one concern. I can tolerate the dry mouth by drinking at least a gallon of water through the day and chewing gum helps but I’ve literally lost my sense of taste!!!! Is this normal?

  29. I’m concerned I keep reading people complaining about dizziness, which can be due to low blood pressure. The side effect of dry mouth is so we can drink water so we can hydrate properly but there is such a thing as over hydrating, make sure you are only drinking half your weight in ounces. Example: weight of 200 lbs drink 100 oz of water, so you don’t flush out your electrolytes in your urine. This is why Sally stresses the importance of balanced meals.

    • Thanks for your comment Priscilla, what you say is very true!
      Sally, phentermine.com

  30. If I threw up about 20 minutes after taking phentermine, will it still work?

    • Hi Eve,
      It’s difficult to say as it depends on how quickly your body metabolizes medications, but if it does have some effect it may be reduced since it’s likely that your body was not able to absorb all of the contents before you were sick. Your doctor should be able to give you a more definitive answer, but if this sickness is something that you’re experiencing a lot on phentermine then it might be wise to speak to your doctor anyway as this could be a sign that phentermine isn’t suitable for you.
      Sally, phentermine.com

  31. I’ve been taking phen for 3 days now. I took 1/2 pill the first two days and a whole pill today. I’ve been feeling like I’m loaded for 3 days now, like Vicodin does to you. Nervousness, moody, thirsty so I drink lots of water and have to pee every five min. Appetite is decreased. Couldn’t sleep last night. I’m hoping these side affects go away soon. Find it hard to think sometimes.

    • I get the same “loaded” feeling and I don’t know what to do about it. I love that it helps me not over-eat but I can’t stand the feeling I get. Are you still having this feeling? How long have you been taking phentermine?

  32. Day 8 and the past 3 days I feel like I’m having a hard time breathing, but my chest doesn’t hurt and my oxygen levels are great, dizzy and horrible dry mouth. Also it has NEVER given me energy since I started, it’s actually made me more tired. Anyone know why this might be??

    • Hi Chris,
      We’re actually publishing an article tomorrow explaining why some people feel more tired on phentermine. Hopefully you will find it useful!
      Sally, phentermine.com

  33. I have taken Phentermine before and it worked wonders. I had planned on keeping the weight off and I was UNTIL I got a boyfriend who eats almost every hour (he has a really high metabolism). I gained all the weight back plus some. I started Phentermine again and I’ve been on it for a little over a month and it’s nothing like it was the first time. I took it one day and got so busy with work I completely forgot to eat, got home and wasn’t able to eat until 9:30pm. Since then I feel like my stomach swelled up and has yet to go down. I feel nauseous every time I eat anything whether it’s an apple or some cheez-its. I’m wanting to know what is going on. Thank you!

    • Hi Kaitlyn,
      It sounds like the appetite-suppressing effects are a little too strong for you this time round, when it is normally the opposite. I would advise you to take just half a pill and see if your appetite is a more like it should be.
      Sally, phentermine.com

  34. Hi,
    I just started half pill this morning 7am. Felt great, Worked out hard, drank lots of water ate not as much as I should have but still some. Then about 4 pm, got really sick vomiting/dirreah and nausea, almost flu like.
    Am I actually sick or can this side effect show up 8-9 hours later?

    • Hi Amber,
      Although nausea is a side effect of phentermine, diarrhea and actually vomiting aren’t typically associated with phentermine. It could be an allergic reaction however, so I would advise you to speak to your doctor.
      Sally, phentermine.com

  35. I been taking phentermine for about 6 days now I lost 8 pounds but since yesterday while working out I felt really dizzy I thought maybe because I was on the treadmill but today in the morning I got really dizzy also not as bad as yesterday but will this go away? How long does the dizziness side effect last?

    • Hi Erika,
      The dizziness usually starts to subside after the first week or so, but you can help to avoid this by being sure to drink lots of water and eat every 3-4 hours – getting dizzy while exercising is usually due to a lack of water or food. If you’ve ever suffered with dizzy spells or low blood sugar then a salty snack such as a handful of salted nuts can help to even your blood sugar levels.
      Sally, phentermine.com

  36. Hi i been taking phen 37.5 for 4 days now and i notice my glands under my neck is swelling and i could use some advise as to how to get rid of the swelling. Its annoying.

    • Hi Crystal,
      Swollen glands isn’t a side effect of phentermine, so if you think it is related or some kind of reaction then we would advise you to speak to your doctor.
      Sally, phentermine.com

  37. I have been taking phentermine for 6 days now and while I do occasionally suffer from anxiety my doctor did state this can make it more noticeable or flare up. But i have been able to kinda cope with it but last night I started to feel like i had to vomit and this morning I had to take my time getting out of bad. Today I took a half of a pill and a few hours later I felt very sick and had to vomit and use the rest room. After lying on my desk for a few mins and eating crackers I felt a little better but I’m very hesitant to eat anything on my lunch as my stomach still feels upset.

    • Hi Ebonie,
      I’m sorry to hear that you’ve been suffering on phentermine. Although you might be wary about eating anything, it’s always best to try and line your stomach as phentermine can aggravate it, and taking phentermine without eating is likely to make any side effects worse, especially nausea and dizziness.
      Sally, phentermine.com

  38. Okay so i just started this meds like two almost three days ago and im fine til one or two in the afternoon then my mouth is so dry and i get a headache and feel like i need to lay down cuz it feels like im coming off the energy high and makes me feel wired will it stop or what should i do i drink like 6 to 8 glasses a day so and im getting ready to start a new job and i dont want this stuff to happen to me around other people and think im weird or cant handle the job please help

    • Hi Danielle,
      Drinking plenty of water will help with headaches and dizziness, so keep up the 8 glasses a day, but also be sure to eat every 3 hours or so as not eating enough can also add to side effects. Phen Drink can help with the dry mouth, here is the link for that: http://www.phen.com/phendrink, and lastly, if you feel that maybe the dosage you’re taking is too strong, then many people find it helpful to split the dosage for the first few days until they get used to the side effects more.
      Sally, phentermine.com

  39. Hi- I just started taking this and I’m really bloated now. Is there anything I can do or take?

    • Hi Sandy,
      If you mean that you have constipation then we would advise to drink plenty of water, cut down on coffee, and to slowly introduce fiber to your diet – if you’ve eaten a lot of fiber in one go and it’s not something you usually eat then this could also be a reason for feeling bloated.
      Sally, phentermine.com

  40. I started taking this med 6 days ago half a pill 37.5 had no side effects except dry mouth, but yesterday morning and this morning I took a whole pill and feel so tired and I did not eat from first day until today maybe all together 1500 to 2000 calories for 6 days
    I know it’s not good but just don’t have appetite but do drink at least 7 bottles of water a day

    • Hi Amber,
      Firstly, you have to eat more – no appetite or not, this is not the way to lose weight – your metabolism will shut down and when your hunger comes back, your body will convert food to fat. If a whole pill is too strong for you, take half a pill and then maybe the appetite suppression will be less aggressive and you’ll be able to eat – the bare minimum is 1200 a day, so you’ve eaten less than two days worth of calories in 6 days. Lastly, you said that you drink seven bottles of water a day but this may be too much, depending on the size of the bottles – you should drink around 2 liters or 8 glasses of water a day – a little more than this is ok but it’s important not to drink too much water as it can cause natural salt levels in the blood to drop which can be dangerous.
      Sally, phentermine.com

  41. Hi every 1 its been 2 weeks now taking phentermine 30g a day im experiencing swollen glands in my mouth and salty taste of my saliva its uncomfortable any 1 pls advice

  42. Hi. Im taking 30mg and the only side effects i get is late at night when i go to bed. I feel funny and light headed. I get cold body chills and i feel scared to fall asleep. Its a very scary feeling. I eat 5200 kj a day and drink about 1.5 litres of water daily. Any suggestions?

    • Hi Lucy,
      Your calorie intake sounds fine, although this is close to the minimum amount for an adult female so if you are tall, very active, or at a high current weight then you might need to eat more than this to sustain yourself. Your water intake could be a little higher – 2 liters per day would be better, especially as phentermine is very dehydrating. Feeling light-headed is usually due to a lack of food or water, a hot environment or some kind of over-exertion. To avoid this, try to maintain a steady intake of water throughout the day and keep to smaller mini-meals to keep your blood sugar levels steady. If you suffer with low blood sugar then a salty snack such as a handful of nuts or some peanut butter can help to make you feel better.
      Hope that helps!
      Sally, phentermine.com

  43. Hi I have been taking 30mg phentermine for 8 days but I don’t see any weight loss yet. Also my blood sugar has been all out of whack, yesterday I thought my blood sugar was going down because I was really shaky and irritable but it was 249 seriously what is going on?? Please you have any suggestion for me.

    • Hi Dorothy,
      Is phentermine helping you to exercise and eat better? This is what leads to weight loss, so if it’s not having those effects for you then that might explain the lack of weight loss. As for the feeling shaky and irritable, these are side effects of the phentermine so they are quite normal and should start to reduce in the next few days.
      Sally, phentermine.com

    • Hey Dorothy, I am a diabetic and my blood sugar has been sooooo crazy, mainly very high since started on phentermine 30gm, 3 days ago. Despite low carb, low sugar eating. It has suppressed my appetite so I am definitely eating less but suffering from extremely high blood sugars. Most feedback is that phentermine reduces blood sugar levels. I’m struggling.

  44. I started taking Phentermine 37.5mg back on 5/8/16 and am currently down about 15lbs. The only problem I’m having is that I constantly feel nauseated and extremely dizzy all the time to almost the point of passing out. Is there anything to do to stop those symptoms?

    • Hi Adrienne,
      Nausea and dizziness on phentermine are common side effects but they usually only last a week or two, so if your symptoms are still quite severe then it may be more related to what you’re eating and drinking. Phentermine is very hydrating so you should be sure to drink 2 liters of water a day – but, too much water can cause a reduction in salt in the body so it’s not a good idea to drink too much. If you haven’t been drinking enough water or if you’ve been overdoing the water then these could be reasons for the dizziness. You should eat every 3 or 4 hours to ensure you have a steady blood sugar level, and if you are exercising then you should wait enough time for your food to go down before you work out – the length of time you should wait depends on what you’ve eaten. Make sure that you’re eating enough calories and enough carbs too – low carb diets often cause dizziness due to a lack of glucose feeding the brain.
      Hope that helps!
      Sally, phentermine.com

  45. I started taking phen, 6 days ago 05/27/16. I was fine the first couple of days & had not experience any bad symptoms before while taking phen.. Today on day 6th I have experience dizziness , dry mouth , constipation & have a really high fever. Do you recommend me to stop taking them & why do I have a fever?

    • Hi Genesis,
      The dizziness, dry mouth and constipation are all common side effects of phentermine so if these are not too uncomfortable then we would just advise you to keep taking the phentermine, although if you’re taking phentermine in pill form then it could be a good idea to halve your dosage until you get more used to the side effects. The fever isn’t a typical phentermine side effect, although a flushed complexion and feeling hot are, so if this subsides then it is nothing to worry about, but if the fever continues then it could be that you are coming down with something like a cold or flu.
      Hope that helps!
      Sally, phentermine.com

  46. I’ve been on this medication 2 weeks going on 3 and I’ve only had 3 small bowel movements and that was because I took laxatives. I have no urge at all to go. Does anyone else have this problem? Also, how long can this go on before it becomes a major problem?

    • Hi Karen,
      It sounds like you are experiencing extreme constipation, and while it is one of the most common phentermine side effects, it is a cause for concern that you have barely had any bowel movements in close to 3 weeks. We would advise you to slowly increase your fiber intake, drink at least 2 liters of water a day, avoid alcohol, and limit your intake of caffeine. If you are taking the phentermine tablets then it could be a good idea to halve your dosage for a few days so that your body can get used to the effects more.
      Sally, phentermine.com

  47. I started taking phentermine and the 2nd day I started having severe headaches. Day 6 tried 1/2 a pill and still severe headache. I get the headache within a hour of taking it and it stays all day. I drink a gallon of water a day and eat 3xs a day. Tried ibuprofen and tylenol neither helps. Will this go away because I’m unable to work out. Any suggestions

    • Hi Stacy,
      It sounds like you’re having a strong reaction to the phentermine, and if even half a pill is leading to a severe headache then it’s clear that it’s not just related to the strength of the dosage. It could be a sign of an allergy to the medication so I would suggest you speak to your doctor to see if he or she could recommend anything different to help you lose weight, whether that’s a different brand or manufacturer, or maybe a different diet pill altogether.
      Sally, phentermine.com

  48. I began phentermine the end of January, and lost 25lbs. I’ve experienced minor headaches and insomnia. I also get different levels of dry mouth. I find it makes me drink even more water, which can’t be bad. I also use Biotene mouth wash or spray, an OTC mouth lubricant which helps. For me, the minor side effects have been worth the results. I hope to lose 10lbs more.

  49. I start phen 5 days ago lost 10 pds
    No side effects except some days esp in afternoon get so tired feel like I’m going to pass out
    I sleep well, no headaches

  50. What causes me to feel so tired??

  51. Started taking Phentermine 37.5 mg and didn’t have any side effects. However, I am a diabetic and ended up in the ER with insulin shock. I stopped taking it after that as when I researched it, a few articles did say it can lower sugar levels. But ever since I stopped taking it, I now have indigestion and constipation and when I do go, the stool is almost black. It’s not blood as I tested it to make sure and again read that Phentermine can make your stools dark. Anyone with diabetes should be very wary of this medication and ensure you check your blood sugar often.

    • Thanks for the information Kathy, this is very important for phentermine users with diabetes to bear in mind.
      Sally, phentermine.com

  52. i started 6-8-16 . i was wondering if bloating is a side affect? i am also having hot and cold sweats and some headaches

    • Hi Angela,
      The headaches are a common side effect of phentermine and some people can experience an increase in body temperature with phentermine so this is also quite normal. The bloating is more likely to be related to your diet than the phentermine, so it might be a good idea to take a look at any foods which you have recently introduced to your diet or foods you are consuming more of than you used to, especially if they have a high fiber content.
      Sally, phentermine.com

  53. Hello, I started phentermine prescription 2 days ago. I have had dizziness and extremely high energy. I feel the appetite suppressant part working for sure. Today (day 2 of phentermine) from about 9:30am to about 8:30pm I ate only 910 calories, a little diet pepsi, and two huge bottles of water (24oz ea). Right about 9:30pm tonight I got CRAZY jitters and dizziness. I recently had vertigo a month ago too and this side effect makes me kind of nervous because I still get an imbalanced feeling in my head every now and then since my vertigo. So I ate a little more food and waited 20 minutes after to see if the jitters would calm down and they didn’t so I ate a little more and it finally went away around 10pm. I knew these side effects before I started taking them. in my first 2 days I’ve taken 2 whole pills. I decided that the side effects were a little bit too strong for me so I want to cut them in half and just take half a day for a while. My questions are:
    1. Will the phentermine still be as effective in suppressing the appetite through out the day as it is with a whole pill?
    2. Is this a pill that after some time the body adapts to the side effects and they won’t be a bother anymore?
    3. Is cardio safe to do while taking phentermine? Since it’s a stimulant I am super nervous about how it makes me feel just sitting, strong pounding heartbeat and warm and a bit sweaty, so I’m afraid just by that to get my heart rate up too high and have something bad happen.

    • Hi Macie,
      In answer to your questions:
      1) Taking half a phentermine is a good idea at first, especially if the side effects are too strong for you. It’s likely that the desired effects of energy and appetite suppression will also be lessened with just half the dosage, but both effects should be sufficient for you to be able to eat healthily and exercise to get started.
      2) Yes – your body gets more and more used to phentermine as time passes, which on the plus side means that the side effects should start to bother you less, but it unfortunately also means that the desired effects often reduce too. If the side effects don’t start to reduce after the first couple of weeks and are particularly worrying or painful then you should consult your doctor to see if phentermine is right for you at all.
      3) It’s fine to do cardio while taking phentermine – if overheating or a very rapid heartbeat are issues for you then try to ease into the cardio workout by warming up and gradually building up your pace. Making sure that the room is well ventilated helps, and be sure to drink water throughout too, so you don’t get overly dehydrated.
      Hope that helps!
      Sally, phentermine.com

  54. I’ve only started taking phentermine 2 days ago the first night I had heart burn and couldn’t sleep, today is the second day that I took it, I was fine in the morning but later in the evening I developed a bad headache was nauseous and dizzy. My chest started aching and I felt like my heartbeat was going at a fast pace when I lay down but I checked my pulse I was at 87 a min Then I have a burning in my throat to my stomach. Is this normal, should I wait to consult my doctor or is it something that will fade away. I’m only 19 and weigh 180

    • I started taking it 2 weeks ago. First week perfect. Second week, every evening about 1 hour after dinner I get horrible stomach pains. This could be heartburn? I’ve never gotten it before. I tried a 1/2 pill and still got it. I have lost 9 pounds, and don’t want to stop, but the pain is unbearable.

      • Hi Jen,
        Usually heartburn or indigestion is located more in the chest area rather than in the stomach. We would advise you to go to your doctor about this pain as it is not a usual side effect of phentermine.
        Sally, phentermine.com

  55. What is the ingredient in phen caps that gives you energy? Does it also boost metabolism?

    • Hi Kelly,
      The stimulants in Phen Caps are theobromine and caffeine, so these are the main ingredients which boost energy. They also contain ingredients which helps to boost metabolism by creating a thermogenic response to effectively heat up the body and improve the way the body converts food into energy instead of storing it as fat. You can read more about the specific ingredients and how they work here: http://www.phen.com/how-to-lose-weight-phen-blog/how-do-phen-caps-work
      Sally, phentermine.com

  56. Hi! I started with half a dose for one week two weeks ago, then last week went full dose and was fine, if a little extra jittery since I was still drinking coffee. I skipped Sunday and then took a full dose on Monday and felt dizzy and kind off for most of the day. Later in the day at dinner I was sitting down and I felt faint. It feels a bit like my heart is beating faster than normal, but I haven’t gotten it checked. I opted to skip Tuesday and Wednesday to see if I’d feel “normal”, but now I just feel extremely tired and really spacey, almost like I’m here but not here if that makes sense. Not sure if these effects warrant medical attention or if this is normal.

    • Hi Margartia,
      The symptoms you’re describing aren’t uncommon but it could be a good idea to speak to your doctor to discuss how skipping days might have affected you and how to proceed in the future. He or she might agree that it’s best to stick to half a dose while you feel that it is still working for you as it sounds like a whole pill is too strong.
      Sally, phentermine.com

  57. HI i started taking the 37.5. After 8 days I felt very dizzy. But what worries me the most is the chest pain and it is making me so uncomfortable. I feel like vomiting. I stopped the caps 2 days ago but the dizziness and the chest pain just won’t fade. I did not consult any doctor as I bought this online. Will the pain go away? What should I do?

    • Hi Tina,
      It’s unlikely that what you bought is actually phentermine but it sounds like you are having a very bad reaction to whatever it was you took. Chest pains are a sign of something serious and should not be ignored, especially if you are still suffering despite ending the medication. You should go to your doctor with your symptoms regardless and explain that some supplements you bought online are the likely cause. No matter what your doctor thinks of online supplements or your decision to take them, your health comes first so he has a duty of care to treat you.
      Sally, phentermine.com

  58. I have taken this for about a month and a half. It really does help if you stick with your diet. My only question is how does everyone else control the hot flashes? I get them quite frequently and I sweat so much it’s embarrassing!!

  59. I have read these side effects and I’m nervous to try it, although I was hoping to. I have friends who have used it with these same side effects, but great results. Does it help if I start with half a tablet, and if so, how long should I only take half before taking the whole tablet?

    • Hi Brooke,
      The best thing to do is see your doctor to see if phentermine is right for you. If it is then your doctor will prescribe you the dosage best suited to you, but if you do find that it is too strong, splitting your pill can help your body get used to the effects. You can ask your doctor for guidance but most people find within a week or two that they are able to move up to a whole pill without an increase in side effects. However, if you find that half a tablet works well for you in terms of energy and appetite suppression then there’s no reason why you can’t continue taking half a pill.
      Sally, phentermine.com

  60. Day three on Phentermine and all in all, I’m feeling okay. I don’t get dizzy..but a little lightheaded which I found goes away when I eat a little something. My struggle is sleeping and a headache. I took Advil for the headache which made me feel yuck but it didn’t touch the headache. Excedrin always helps me but I’m afraid to take it with the caffeine in it. I’ve tried the sleepy time tea and bath at night and I fall asleep, but I can’t stay asleep. What can I do about these two issues?

    • Hi Lori,
      Personally I always favor ibuprofen for any aches – it’s much more effective as it reduces swelling as well as blocking pain receptors. Take up to 600mg every 8 hours but don’t exceed this dosage, and remember to take ibuprofen after eating to avoid stomach upset. You should also be sure to drink lots of water as the main reason that phentermine causes headaches is because it is very dehydrating. The insomnia you’re suffering from is very common on phentermine. You can try reducing your dosage for the next few days to see if that helps with the adjustment period, although this is only possible if you are taking phentermine in pill form as they can be broken in half. These side effects should start to wear off over the next few days even if you are unable to reduce your dosage though, so unfortunately it may just be a case of waiting for these symptoms to subside.
      Sally, phentermine.com

  61. I started taking phentermine almost 30 days ago I weighed 247 lbs and I\’m down to 225 it makes me really gasey loose bowel movements but the best thing about it is I’m not eating as much no other side effects

  62. Hello,

    It is my first day taking phentermine. I started at 7 am after breakfast, now at 12 pm i started feeling dizzy, lightheaded, heavy on back of my neck and my vision quite blurred. I find it bearable, because earlier my only concern was heart palpitation. I don’t have all that as yet. I feel quite relaxed. I observe my water intake and food too. So for the headache, can i take paracetamol? Will it help to reduce the dizziness by taking other med? Any other suggestion to reduce the effect?

    Thanks, Nia

  63. I just started it yesterday and it has killed my appetite which is good but I have to pee all the time and being a truck driver that’s no good. I’m afraid that I won’t be able to continue to take it.

    • Why don’t you buy a urinal….I was a nursing assistance once…an if I was a guy that’s what I would do!

  64. I have been on it almost 33 days and my mouth is so dry & my left cheek in the bottom of my mouth the gum is swollen & very sore the lower part of my mouth. When I was taking this & the thyoriod together my throat would be so hard to swallow, so I quit the only thyroid & and it is better but my bottom gums are very sore & sensitive on the left side of my cheek. I feel better when drinking something but it seems to inflame every day after a while after I have taken my pill. Wonder if I am allergic to it or if this is just a side effect

    • Hi Cindy,
      It sounds like you have the dry mouth side effect very bad. Dry mouth means a lack of saliva in the mouth which can then lead to sore gums, infections and sensitivity. You should speak to your doctor to see if he or she can recommend some kind of remedy for dry mouth.
      Sally, phentermine.com

  65. I started taking Phen 3 days ago and my headaches are outrageous… I remember when I took this 17 yrs ago the only side effect I got was dry mouth.. I seem to have both now.. But anywho, I carry headache powder with me everywhere and in a matter of 5 min it wipes it out completely! Good luck, here’s to prayin I lose this weight again!

  66. I have been taking phentermine for about 6 weeks now and I have decided to stop. I feel extremely tired and I have a strange feeling in my stomach..it isn’t nausea or pain..just strange discomfort. My main concern is what this med can do to my heart..I feel very strange. I have lost 10 pounds which for me is a miracle because I have tried so many things and nothing worked but I feel something is wrong with this medication but I can’t tell what it is. I also have tooth pain which I’ve never had before. Would love to hear from you, your thoughts on this. I really don’t want to stop taking the med because it helps but I am afraid of its long term consequences to my health.

  67. I’ve taken phentermine for a month and 1/2 with no major issues but one that I think may be linked to the pill. On 3 occasions my lips were swollen a bit. Nothing too noticeable but swollen nontheless. At first I thought it was a reaction to a new lipstick then I thought maybe my chapstick but the last time it seemed to be in relation to the pill as I had not used any products on my lips. I find it odd that an allergic reaction would only surface rarely in the time I’ve taken it. I do believe on those occasions I was drinking much caffeine. Do you think the caffeine had an impact on the lip swelling or was it just the meds? I’d like to take the meds but want to be safe. Is it possible to take a benedryl with the pill to counteract any swelling or would they just cancel each other out? I talked with my dr and she said stop immediately but didn’t give much thought about it or discussion. I’d like to know if anyone else has experienced this and your thoughts about continuing the medication safely. Thanks!

    • Hi Leela,
      I haven’t heard of this exact reaction before but it sounds like you are allergic to phentermine. Allergies to phentermine usually occur in a rash but lip swelling is also indicative of an allergy. Your doctor should have explained further but it sounds like it could be inadvisable for you to take phentermine as it could result in more serious allergic reactions, such as difficulty breathing or throat swelling. It could also be an allergy to caffeine though as allergies can develop at any time in your life so one way to check could be to stop taking phentermine and see if it continues when you drink caffeine.
      Hope that helps!
      Sally, phentermine.com

  68. I have been on 37.5 since Sept 1 2016…I did do half for two weeks. I have lost 20lbs so far….about 15 to go. I only had the dry moth til now. I now have dizziness. I have a feeling of being out of breath in the am. This is after sitting drinking my coffees …which is at least a hour….Why would it start now? I have been following a low carb diet…because I’m not hungry it has worked.

  69. This has also managed my IBS because it has slowed down my digestion so much. Or maybe because it’s better because I’m eating less. Anyone else with IBS having this result??

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