You NEED To Know: Phentermine and Alcohol

General Phentermine Questions?
Check out the ultimate guide to phentermine weight loss pills!

Most of us like to relax with a cold beer or a glass of wine after a hectic week, but then we also know how alcohol isn’t great for our health. When you’re aiming to lose weight, alcohol is often best avoided due to the number of calories it contains and the effects it has on the body, but for those taking phentermine there are further risks to consider. Here we explain how alcohol hinders your best weight loss efforts and why it is inadvisable to mix phentermine and alcohol, with respect to both the success of your weight loss journey and to your health.

 How Alcohol Effects Weight Loss

The bottom line is, alcohol and weight loss really don’t mix. There are several ways in which alcohol negatively effects the chance of success on your weight loss journey. Firstly, alcohol contains many empty calories, meaning it is high in sugars which get converted to fat without providing the body with any nutrition. Secondly, alcohol decreases testosterone levels and causes fluid loss and tiredness, meaning exercise is more difficult and less effective. As a depressant it also suppresses the functions of the liver for as long as three days following the consumption of alcohol, meaning it limits your body’s ability to burn fat and build muscle by stopping the liver from processing food into energy. Lastly, alcohol leads to poor food choices as it activates hunger messages in the brain, leading to cravings for unhealthy foods high in saturated fat and salt.

Keep reading to learn more about phentermine and alcohol, or check out the infographic below if you’re in a hurry!

The Interaction between Alcohol and Phentermine

For those taking phentermine to lose weight, as well as the effects of alcohol on weight loss, there is the additional reaction between phentermine and alcohol to consider, which comes with risks to health and potentially dangerous side effects. The problem with combining alcohol and phentermine arises from the fact that phentermine is a stimulant while alcohol is a depressant. Phentermine works as a weight loss medication because it directly affects the central nervous system by suppressing the parts of the brain responsible for appetite control, while other functions are stimulated to enhance energy and tolerance to intensive exercise. By contrast, alcohol suppresses the main functions of the central nervous system. The mechanisms of phentermine and alcohol are different, so simultaneous consumption of these can result in a negative drug interaction.

Warnings about drinking alcohol while taking phentermine explain that the combination can increase the risk of cardiovascular side effects, such as increased heart rate, chest pain or changes to blood pressure. You may also be more likely to experience symptoms such as dizziness, drowsiness, depression and difficulty concentrating. This thread from the forum demonstrates some of the side effects that those taking phentermine have experienced, including jittery feelings, an inability to concentrate or interact in conversations, feeling on edge, and enhanced anger.

In addition to these negative side effects, alcohol also makes phentermine less effective, as one of the forum users mentioned in the link above. Alcohol activates hunger and greatly limits the effectiveness of the phentermine by reducing the appetite suppressing effects that phentermine has on the brain, while also decreasing the energy boost that phentermine supplies. Alcohol also effects the pH balance of the body, making it more acidic; phentermine has been shown to last longer in the body by as much as twice as long when the pH balance is more alkaline, which can be achieved by eating lots of fresh fruit and vegetables, while refraining from unhealthy acidifying foods and drinks like ice cream, butter, coffee and alcohol.


Can I Drink Alcohol While Taking Phentermine?

It’s best to refrain from drinking alcohol while taking phentermine, or at least to limit the amount of alcohol you consume. Your doctor will explain to you what you should and shouldn’t do while taking phentermine, including your recommended maximum intake of alcohol. To ensure that you are more aware of how alcohol affects your body when you begin taking phentermine, you should aim to drink slower and to alternate alcoholic drinks with glasses of water to keep yourself hydrated and to give the alcohol time to enter your body so you can monitor how you feel. If you begin to feel unwell or experience symptoms such as those mentioned above, you should stop drinking alcohol immediately.

While it is true that some people experience no adverse side effects from mixing alcohol and phentermine, it is something that everyone should approach with caution, as when taking individual differences into account, this kind of drug interaction can be very dangerous for some people. Much of the success you will gain from your weight loss journey is related to knowing your body and acting in a way that you know is right for your health and well being. This means avoiding or at least limiting your alcohol intake so as not to experience these negative side effects when mixing alcohol with phentermine, as well as in order to enjoy a healthier lifestyle in the long term.


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66 Responses

  1. How do you tell someone that it’s making them crazy?

    • There’s no good way to tell your wife she’s crazy. You might want to consider calling her doctor and voicing your concerns. He will probably live if he tells her instead of you.

      • Hahahaha. Great advice! 😂

  2. Be honest that you are concerned this pill is changing their mood. Have things gotten better or worse ?

  3. Just tell them. Honesty is the best. But be nice about itm

  4. Hi,
    My doc just prescribed phentermine 37.5 for me for a month to assist with the 35pds I put on over last 8 mths. Healthy other than arthritis issues which I see Rheumatologist for. I joined a cardio work out program to go 2x week which I start Thurs. I am sometimes sensitive to meds so I’m careful, such as benadryl I’m very allergic to but can take over counter cold meds. Question is….starting this new med phentermine and one of the side effects is heart rate increase am I ok to take it and go do my cardio work out? Is it going to be to much? They do monitor my heart rate at the gym im going to during the hour work out. I really want this to work and can handle most side effects listed but don’t want any heart issues. Im 44 yr old woman who eats mostly healthy just getting older and can’t keep weight off like I use to. Goal is 30 lbs in 3 mths. Only taking this med for a month.

    • Hi Laura,
      An increase in heart rate is a common side effect but nothing to worry about, and the majority of phentermine users do some kind of cardio while taking the medication. We would advise you to start the workout program but to be conscious of your heart rate and stop if at any point you feel discomfort or pain, especially in the chest.

  5. Dear Concerned Husband:
    OMG!!! I totally agree!!!! I have a very dear friend who has been taking it for over a year now and it is making her totally crazy!! She has these intense anger outbursts that are demonic!! I don’t even know who she is anymore. It’s so sad because I’ve known her for 30 years and now she’s become the spawn of Satan.
    The anger outbursts are more intense when she has a few alcoholic beverages while taking the phentermine!

  6. I can usually drink and I can drink, well I started taking these two medications about three weeks ago I lost seven pounds, however, we have gone out twice, I have had three drinks while we were out. The first night I passed out at the bar, he had to carry me home and into the cab, and the second night I was out like a light! I do not remember anything I only had three jack and cokes, and believe me I can usually put them down !! These drugs and drinking are very dangerous, I will not be drinking and taking these meds ever again !!!! Thank god I’m alive, I fell flat on my face in the bar, blacked out and that is not like me at all !! very scary!

    • This happened to me this weekend! I am down 25 lbs and I take the 37.5 pill in the AM. This weekend I had a few captain cokes and I totally blacked out. I don’t remember a thing, I woke up in the hospital. I will not ever drink again while on this mediation.

      • Hi Joanna,
        Thanks for sharing your experience with us. We try to err on the side of caution when advising our readers about mixing alcohol with phentermine, but we’re sorry to hear that you had such a strong reaction. We hope that our other readers bear this in mind and take precautions when mixing the two.

  7. I’ve just started Phentermine 30mg and it’s already amazing for my appetite suppression. The only issue I have is that I’m craving cigarettes and alcohol! I used to be a methamphetamine user so I think the Phentermine is giving my brain that same trigger. I feel completely fine after a few beers; I’m just worried the calories from the beer will hinder my weight loss. I’m not usually a big drinker anyway, but it’s been a few beers every night lately. I’m living off beer and steamed veg lol

    • It’s been a couple of months now. How are your results? I just got my prescription today and it’s for 30 mg. Also, I’m curious to see how I do if I have a couple of cocktails while taking them.

  8. Omg!!! I have been taking it for 2 days…it’s great and I’m not hungry but do try to put some healthy food in my body… I need to lose 50kg…back injury…all a bit of a nightmare… But I have to admit I do suffer anxiety… Depression and I’ve used alcohol for a very long time to self medicate …25 Years… From the generation of binge drinkers!!! I am realising… Slowly …2 days …and yes I’ve been drinking… That I’m not getting the buzz I’d usually get!!! So I need to get it out of my life…its very hard…but alcohol is the reason I gave the typically fat around the middle . I’m 47 on Monday and shit I need a wake up call…yes I’m a mess ha ha…constructive feedback only please 🙂

    • I can relate completely. Same age as well.
      Can you tell me if you are still doing this medicine. I’m thinking of trying it out and wanted to know how it’s going. Thanks


  9. Janet – I hear you! You aren’t alone. I like a daily drink. Or two and while I lost the first week to 2, nothing since then. I know it’s a crutch, a habit, my signal to relax and that I really will do much better in many ways to eliminate it, but it’s harder than dieting. Going to give myself Friday & Saturday and see if I can’t gain some control during the week. I always felt one isn’t hurting. I have to think hard how I want to lose the weight, and I can go back to an occasional cocktail. I’m sabotaging myself. Good luck to you.

  10. So would it be really bad if I had a glass of wine? How long does phentermine stay in your system ?

    • Hi Ainka,
      It’s fine to have the odd glass of wine, although it’s important to bear in mind that alcohol does slow down the liver for several days, meaning your weight loss might stall as a result. Phentermine stays in your system for up to 72 hours but if you’re just having one glass of wine then there’s no need to stop taking phentermine. Just let a trusted friend know that you might have a different reaction to normal and remember to keep hydrated by drinking water at the same time.
      Sally, phentermine.

  11. I’ve been taking phentermine 37.5 for around a week and with the exception of the first day or two of feeling a tad jittery/more energized I feel like I haven’t experienced any side effects whatsoever and I was worried about taking it beforehand. I’m 27 years old, 6ft and 200lb – I just wanted to drop about 20 lbs or so. Anyway, things are going fine but I have a bachelor party trip coming up in a couple days and I haven’t drunk since being on phentermine. I’ve read what others have said about being careful taking phentermine when drinking. But this is my best friend and we will be drinking quite a bit (nothing crazy but more than normal obviously).

    We will arrive Thursday afternoon and come home Sunday morning.

    I haven’t missed a day since I started taking phentermine like 8 days ago or so. My plan is to take it tomorrow (Wednesday) and then not take another one until Monday when I get back home to get back on my regular schedule.

    If I stop taking it should I be okay on the alcohol front?

    Side note – for the past month prior to taking the phentermine I had been having chest pains/tighteness on my upper left side (not sure why) for about a month. After taking phentermine I haven’t really had chest issues in a week.

    Thanks for any responses.

    • Hi Jon,
      It’s probably too late to advise you to not take the phentermine today, but just so you are aware, phentermine can stay in the system for up to 72 hours so it could be a good idea for you to take it a little slower on the alcohol front on the first day (Thursday) and see how you feel. Let a more reliable friend know and ask him to keep an eye on you. Try to drink water throughout the day/night as well and remember to eat something filling before you start drinking heavily – dairy products like yogurt are also good for lining your stomach before drinking.
      Have fun!

      • Hey Sally, after I wrote that I seen where you said phentermine stays in your system 72 hours so I didn’t take it today and won’t be. Just want to be careful. Thursday (tomorrow night). Will be the first night of the trip where we go out. I’ll try and take it slow that night for sure.

        • Hi Jon,
          That’s great, it’s better to be on the safe side definitely. Hope you have a great weekend!

        • How were you on your bachelors weekend as I am going to a mates bday party in a couple of days and want to know if you had any bad reaction cheers.

  12. Love the reviews. Just started my journey today with the pills. Craving a glass of red wine. Smoking cigarettes like crazy. I feel real jittery 2. What now? Hopefully my weight loss…good luck everyone.

  13. I’m afraid my experience of phen has ended abruptly. Palpitations, waking up sweating in middle of night and a crushing sensation in the middle of my chest like an air bubble you can’t get rid of with a burp. The first time this happened I drank 2 large glasses of wine. Stupid and Scary. Have also had an impending sense of doom and depression like nothing I’ve ever known. I am guessing I have a condition I wasn’t previously aware of. Off to docs to find out. Please be careful everyone. Even if this is nothing, the side effects have been so nasty I won’t be using phen to sort my weight out.

  14. I’m going on a family cruise in 6 days. Um not a heavy drinker but I plan on having a few frozen alcohol drinks. When should I stop taking phentermine to be able to enjoy my drinks without worrying?

    • Hi Dee,
      Phentermine can stay in your system for up to 72 hours, so if you want to be sure that there is no phentermine in your body then you should probably stop taking phentermine 2 or 3 days before you leave. Have fun on your cruise!

  15. I have been taking this medicine since 1/4/17 and I didn’t have any serious side effects. I’m taking 37.5mg and I only have a burst of energy all day and find it hard to fall asleep at night. I have craved a glass of wine but I’m willing to fight that craving to see the full impact of the meds mixed with healthy foods and cardio. Good luck everyone and I will update after 15 days to say how much weight lost. Oh I am 5ft 175lbs starting out so I will weigh myself soon to see the results.

    • Hey Kimberly,
      If you want to connect with other phentrmine users and chat, swap advice and experiences then join our forum here:

      • Okay thanks so much. I appreciate it.

    • How are your results? 🙂

  16. I am here because I started phentramine two days ago. Tonight is my regular girls night out when we go sing karaoke in our local pub. I took my phen at 8 am. I want to know if 2 beers are ok to have around 10/11pm?
    Also, the only side effect I’ve had is one that I occasionally suffer from anyhow. Palpitations; usually when I’m stressed out I’ll have some, when the stress leaves so do the palpitations. Now, I’ve had a lot of energy the last couple days and I cleaned my entire house very quickly today and as of 2:30 pm had not eaten… I had forgot! I realized I’d been on the move for a while, sat down to relax and felt better. I can say it definitely curbs my appetite. I\’m not hungry at all. Doc put me on for 30 days then I’ll recheck to get w him. Inneee to get a jumpstart on some wieght loss but shooting for 20 this month alone… per doc. Anyhow, still debating the beers. I like to be cautious.

    • Hi Dori. Thank you for reaching out.Alcohol can slow down weight loss, and can also inhibit the effects of phentermine, plus the combination of phentermine and alcohol can cause you to feel the effects of the alcohol much quicker, so it’s best to avoid alcohol while you’re taking it. However, if you just want to have a drink or two for a special occasion then this is unlikely to cause you any problems – just be sure to drink water throughout the night and ask a trusted friend to keep an eye on you.

      You are welcome to join our brand new support group so you can connect with other phentermine users, share your experience and get some valuable advice.

      Have a nice day!

  17. Can a person with fatty liver and a leaking heart vault take 15mg Phentermine? That’s my situation and I can’t lose weight. Thank you for your advice in advance

    • Did you ever figure out if you were able to take the medicine with you condition ?

  18. I was 5′ 7″ and 200 lbs. when I started Phen on Jan 17, 2017, I am now (March 17, 2017) at 185 lbs. (This is the ONLY thing that has ever worked for me)
    I drink 1-2 glasses of wine 4-5 times per week, it seems the Phen makes me crave wine, and I started working out 3 times per week. I have noticed the weight is coming off MUCH slower since drinking the wine and I have an occasional head ache the next morning. I only take 1/2 of the prescribed 37.5 pill. I have noticed my blood pressure has gone up from 110/65 to 128/90! I am wondering if I should stop taking the meds because of my blood pressure.

    • Hi Myra,
      If your increase in blood pressure is a concern then you should speak to your doctor to see if he or she agrees with you coming off phentermine. However, drinking wine most nights definitely sounds like something you need to stop or at least reduce for the sake of your health and your weight.

  19. I\’ve only been taking phentermine for a couple of days now. We are going out tomorrow night. I took a pill at like 7 this morning and was going to skip my dose tomorrow to make sure I don\’t have any interactions. I know for weight loss reasons, that\’s not the best route. But it\’s my birthday, so I\’m making an exception. Just want to err on the side of safety! Will the phentermine be out of my system enough by tomorrow night to enjoy a night out?

    • Hi!
      Phentermine should be out of your system after 3 to 5 days. Drinking alcohol can increase certain side effects, so if you were thinking about indulging in some of that, it is best to cut down or exclude alcohol from your diet while you are taking phentermine. Phentermine may also impair your thinking or reactions, so be careful if you drive or do anything which requires you to be alert! During the first few days of phentermine it’s advisable to monitor how you feel in order to self-assess how the medication is affecting your body. If you feel uncertain about taking on certain tasks, seek advice from your doctor if you need further reassurance.
      In the meanwhile, be sure to drink lots of water, and let friends and family know that you’re taking the medicine so they can help you out in case you start to feel different during your celebration.
      Oh, and happy birthday!



  20. Should I be concerned if this medication actually give me more patience and keeps me in a better mood ?

    • Hi Massiel!

      We definitely recommend you consult your doctor if you are experiencing changes or side effects, including positive ones such as these.

      You could also visit our user support page on Facebook or join our forums and share experiences with fellow phentermine users.



  21. I started phentermine a week ago and noticed the change of appetite suppression immediately. Started eating better and drinking lots of water as my Dr. suggested. In 1 week I\’ve gone from 365 lbs to 351lbs. Last night had family in town and sat at a bar-b-que as we do in TX, and attempted to drink an alcoholic beverage. I could not finish it as I was starting to feel really weird while drinking. Now I know after reading this forum, not to mix alcohol with Phentermine.

  22. Question:
    I take phentermine once a day in the mornings. If I knew I was going out for an event that involved drinking, how soon should I stop taking phentermine? Example: 24 hrs or 48 hrs prior to the event? Just wondering. Drinking for me isn\’t a necessity and I can surely go without if need be.

    • Hi Susan! It’s really not recommended to drink alcohol while using phentermine. The problem with combining alcohol and phentermine is that phentermine is a stimulant while alcohol is a depressant. The combination can increase the risk of cardiovascular side effects, such as increased heart rate, chest pain or changes to blood pressure. You may also be more likely to experience symptoms such as dizziness, drowsiness, depression and difficulty concentrating. Your doctor can give you more information on phentermine and alcohol, so we also suggest speaking to him/her about this concern.

  23. I have been drinking 30 mg phentermine once a day for 3 days but insomnia is bad. Will it get better and/or can I drink anything to get a better night sleep?

    • Hi Maria! It is reasonably common for patients taking phentermine to experience insomnia during the first few days of their prescription, but if this side effect continues then you should consult your doctor to ask about the possibility of a lower dose, or to see if he or she has advice for how you can help to minimize this problem. You may also be interested in this post with more info:

    • Hey ! The best way to avoid that insomnia , is to take the pill at about 5 am . Set your alarm ! I did that . I\’ve burned all my energy by bedtime . Also your body reacts badly if you are not having ENOUGH calories . Make sure to eat 1000 calories . Your body will go into starvation mode if you starve yourself . So even if you starve yourself , or just eat fruit all day , your body will retain it all . But if you eat your daily 1000 calories , your body will be nurished enough to be able to burn fat in your body and relax your body to let you sleep . Also no soda . Water is best and milk

  24. Wow, I\’m about to start taking the low dose. Seeing these posts have been very helpful. My pharmacist stated that it may cause insomnia, has anyone experienced that?

    • Hey ! The best way to avoid that insomnia , is to take the pill at about 5 am . Set your alarm ! I did that . Ive burned all my energy by bedtime . Also your body reacts badly if you are not having ENOUGH calories . Make sure to eat 1000 calories . Your body will go into starvation mode if you eat to little , or just eat fruit all day , your body will retain it all into fat. But if you eat your daily 1000 calories , your body will be nurished enough to be able to burn fat in your body and relax your body to let you sleep . Also no soda . Water is best and milk. I only lost 6 pounds in 3 weeks . But once I started making sure to eat a full 1000 calories but no more that\’s that . I dropped 10 pounds the next week . And no insomnia or bad mood swings

  25. Started taking phentermine 10 weeks ago combined with a optifast 800 full meal replacement dr supervised, 850 cal. 50 yr old 5\’8\” male started at 269. Down to 220. Stuff really works.
    Not hungry. Lots of energy. Have only had two drinks in that time. Didn\’t notice anything strange as far as side effects. On a mission, so not indulging to much. Have a vacation coming. Want to relax have some fun, and some drinks but don\’t want any large setbacks. Don\’t want to die either. Not sure if I should just go off of them for that week? Or see how it goes.

    • Hi Ac, thanks for your comment! We’d recommend speaking with your prescribing physician about this. It’s really not recommended to drink alcohol while using phentermine due to the heightened risk of serious side effects. The fact that you’re also on Optifast only adds another variable into the equation. Your doctor can give you more information on all of these interactions, so we suggest speaking to him or her about your questions and the possibility of stopping phentermine during vacation if you plan on drinking. He/she knows your case best and could best advise you on this decision.

  26. I started taking phentermine today and a water pill , I only took half a pill of the phentermine because I have anxiety and I have tried phentermine in the past for a couple of days back in 2008 and felt anxious so I was advised at that time to take half a pill , so this morning around 6 a.m. I took the pill with a full glass of water , I have had energy today but have felt kinda buzzed all day like if I had a drink and now my body feels a little tingly , I take depression and anxiety medicine at night so it will be safe to still take my normal meds ?

    • Hi Darla. We strongly recommend speaking with your prescribing doctor about these multiple medications ASAP. It can be very dangerous to combine phentermine with water pills or other medications (including anxiety and depression medicine). Therefore, you should not combine these medications unless directly instructed to do so by your prescribing doctor. We are not qualified to dispense medical advice, but we would suggest speaking immediately with someone who can more expertly advise you on these potential combinations.

  27. I started with 30mg but decided to break in half since I was experiencing my heart racing. I also had headaches. This is normal right? Does your body take a few days to get use to this drug?

    • Hi Allie! Yes, it’s normal to experience some heart racing and mild headaches when starting this medication. However, if you have chest pain, severe headache, or any of these other more serious side effects, make sure speak with a doctor right away.

  28. I started on 15 mg (I also am on warfarin 10 mg) and have been on it for about a month. Have lost close to 20lbs – slow but steady wins the \’race\’. My concern is the the insomnia. Even that minimal dosage has effected my sleep. Called my doctor and she suggested taking it every other day and that has helped even things out for me. Glad I found this site, will check out the forum as well.

  29. I\’ve been taking phentermine for a week now. I\’m not a heavy drinker, but I do like to relax with a cigar and a finger of scotch or bourbon or a beer. When I do this I don\’t drink more than 1 beer or a single of bourbon. Will having that one beer or drink once or twice a week be a huge issue on phentermine? And also I drink craft beer, so will the higher alcohol content of craft beer be that bad even if it\’s just one?

    • Hi Mike!

      We do not recommend taking alcohol during your phentermine treatment. Using phentermine with alcohol can increase the risk of cardiovascular side effects such as increased heart rate, chest pain, or blood pressure changes. In addition, you may also be more likely to experience nervous system side effects such as dizziness, drowsiness, depression, and difficulty concentrating.

      There is no way to tell you how much alcohol will be required to affect you in what way while under the treatment; there are too many variables. But the important part is this: there are risks and it’s not recommended.



  30. Hi I started Phentermine last Sunday, I was fine with no symptoms really until yesterday, I drank more than 2 cups of coffee, my heart was racing, it felt like tingling vibrations traveling through my body like my nervous system is all over the place. So I have learned my lesson and will Change to decaf-coffee, buy I am a smoker like a pack every 21/2 says does this interfere with is medication?

    • Hi Anissa!

      Caffeine and phentermine usually have those results you experienced, because both are stimulants (phentermine being much, much stronger than anything out there) so you’re pushing your nervous system to new levels and this is taxing for your body. In the same vein of taxing your body, we’re well aware that you’ve heard it before, but we definitely recommend quitting smoking. Although it does not interfere with phentermine per se, nicotine is also a stimulant (and it comes with a long list of additional problems, like heart and lung disease). Some phentermine users have reported extreme reactions to smoking while on phentermine (feeling sick, heart racing, stomach issues) but there’s not enough date on interactions to specify contraindications. It does not seem to interfere with the effects of phentermine, at least.



  31. Today is Wednesday. On Friday I plan on going to my best friends birthday party. I\’ve been on phen since February, 37.5 mgs. I\’m worried about the phen and alcohol. I was thinking I\’d just not take my pill tomarrow that way I\’d be ok to drink at her party. Is this ok?? One of my worries is that I don\’t want to start into withdrawl if I do this, and I don\’t want to take a pill the day of her party. Any suggestions? Thanks!

    • It’s best to completely avoid alcohol while taking phentermine. The two substances can interact negatively and make side effects worse so, if possible, it would be better to opt for non-alcoholic beverages this weekend.

  32. Hello everyone! I just dropped my prescription for Phentermine at the pharmacy today.. I was thinking of starting the pill today. I had a few alcoholic beverages yesterday. Is it okay to take after a day of drinking? I know its not ok to take during and Im not a big drinker so that\’s fine but was curious about taking it a day after I had drinks? Thank you in advanced.

    • Hi Jessica! It depends on how much and when you drank yesterday, but if it was a moderate amount and it’s been over 24 hours, you’re probably okay (check out this article for more info on the metabolism of alcohol: The important thing is that you avoid having both substances in your system at the same time. Just to be sure, double-check with the pharmacist when you pick up your prescription: he or she would be able to tell you for sure. Best wishes!

  33. Hi! I am currently in a weight loss program. The doctor gave me this Rx for 37.5mg of Phentermine as an option today and told me to take it only if I wanted to and said I didn\’t have to take it consistently. I decided to take half to see who it made me feel since I am sensitive to medications. It gave me great energy and definitely suppressed my appetite! What I didn\’t realize was that I can not drink when taking this medication. I have plans to watch a ball game tonight with a guy I just started seeing. I planned on just having a drink, maybe two. I was going to have tequila seltzer and lime since its low calorie. Is this a really bad idea or should I be okay? I took the half dose at around 9 am and I am meeting him around 6 pm.

    Thanks for your help!

    • Hi Jane – sorry for the delay in getting back to you! In case other people have a similar question: you should avoid alcohol while taking phentermine (even if you only took half a pill) because the combination can cause or exacerbate side effects. Since you don’t know how you’ll react, it’s best to stick with non-alcoholic beverages like juice or diet soda, especially if you’re with someone you don’t know very well. Best wishes!

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