new phentermine user

The Phentermine New User Guide

We like to keep our readers informed about phentermine and how to maximize its effects to lose weight. But if it’s your first time then it might be overwhelming to be confronted with so much information. So, for all of you phentermine newbies out there, we’ve put together this handy new phentermine user guide to deal with all your potential questions in one place!


Depending on the brand or manufacturer, phentermine is available in dosages from 8mg to 37.5mg. If you’re new to phentermine then you may be prescribed 15mg or 30mg to start with. However, 37.5mg per day tends to be the most commonly prescribed dosage, as we explain in our comprehensive phentermine dosage guide. Factors that influence what dosage your doctor prescribes include: whether he or she is prescribing tablets or capsules, the duration of the prescription, which brand you will be taking, your health, and your tolerance to medications in general.


Ideally when you’re prescribed phentermine you should be advised about what to eat and what side effects to expect. However, we understand that sometimes consultations are rushed and doctors don’t always have the time to explain everything. That said, at the very least your doctor should tell you exactly when to take phentermine. If you’re not sure when to take your phentermine then you should get in contact with your doctor as soon as possible to clarify this. Your doctor will most likely advise you to take your phentermine first thing in the morning, usually an hour before breakfast. But remember, if you work nights or different shifts each week then your doctor should take this into account when devising your instructions.

Side Effects

Due to individual differences, side effects can vary a lot between patients. Firstly and most importantly, due to the way that phentermine affects the heart, if you experience any heart pain or an irregular heartbeat then you should stop taking phentermine and speak to your doctor immediately. Similarly, if you experience any signs of being allergic to phentermine, such as swollen lips or eyes, itchiness or breathing problems then you should also discontinue phentermine and speak to your doctor.

But, it is more likely that you will experience some of the less serious, more common side effects while taking phentermine. Thanks to feedback from our readers and forum users, we’ve been able to provide lots of information about the various side effects here on our blog. The most commonly reported physical side effects are dry mouth, constipation, headaches and insomnia. Many phentermine patients also experience psychological side effects such as increased anger and depression. Therefore it’s a good idea to monitor any changes you notice as a new phentermine user, both physically and psychologically. Thankfully most side effects are not serious and subside after a week or two; you can help to reduce some side effects by drinking plenty of water and eating a balanced diet of small regular meals.

In addition to the listed side effects, some patients may notice other changes. Many of our readers have noticed changes to their period while taking phentermine, and some have noticed an increase in hair loss. These are considered indirect side effects which occur as a result of losing weight. But if you experience any concerning or worrying symptoms on phentermine then you should seek advice from your doctor.

Appetite Suppression & Energy

Phentermine works by suppressing appetite cues and increasing energy levels. This in turn motivates you to make healthier food choices and to become more active in your daily life, resulting in weight loss. As with phentermine side effects, the desired effects of appetite suppression and energy can vary from person to person. While some people will find that they have no appetite at all and can easily forget to eat for hours, others will experience no significant change in hunger. Similarly, others will find that they are bursting with energy and can’t sit still while other users will actually experience tiredness on phentermine.

Ideally your experience will be somewhere between these extremes, but if not then you can improve how your body reacts to phentermine. If you find the effects too strong and are jittery or have no appetite then reducing your dosage should work. If on the other hand you don’t seem to be experiencing the desired effects of phentermine then you can follow these tips to boost energy and this advice to suppress your appetite.


Here at we don’t recommend any specific diet for phentermine users. This is because the diet which works for one person might not work for another; even scientific comparisons of diets have found that no diet is better than any other. Sticking to your chosen diet is far more important, so choose an eating plan which works for you. Furthermore, for long term weight loss success, it’s best to consider long-term diet changes, rather than fads and quick fixes. So, focus on small but permanent changes and it’ll be easier to really commit to your new diet.

new user phentermine

But, there are some universal rules can work to help get you started if you’re new to phentermine. First off, you should make sure to drink at least 2 liters (68oz) of water each day. This will help shift water weight, suppress hunger, improve metabolism and reduce phentermine side effects. Secondly, people find that counting calories helps as it gives them a clearer idea of how much they can eat. Lastly, diets which promote eating healthy whole foods such as fruit, vegetables, legumes, lean protein, nuts and seeds are a good option; eating these types of foods ensures that your body gets the nutrients it needs to supply energy, build muscle and keep you strong and healthy.


Unless your doctor advises you not to exercise then you should be exercising from your first day on phentermine. Depending on your age, health and weight you may not be able to commit to more than minimal physical activity. But we believe that there is a suitable activity for everyone, even if you want to lose over 100lbs, or if you’re suffering with an injury. If you’re new to exercising then we have some great tips to get you started with exercising, as well as ways to make exercise more fun. If you’re pushed for time then we have some great ways to fit in exercise; even if it’s just ten minutes a day, as quality is more important than quantity.

Lastly, exercise doesn’t just help you to lose weight and greatly improve your chances of long-term weight loss; getting active will boost your mood, confidence and energy levels as well as many other added benefits. And if you’re suffering from phentermine side effects such as constipation, depression and insomnia, then exercise helps with those too.


Many doctors prescribe supplements alongside phentermine, including vitamin B12 shots, 5-HTP, and chromium. These supplements are intended to help boost phentermine’s effects to give you more energy and greater appetite suppression. They can also help to reduce the side effects that many people experience on phentermine, including insomnia and low mood. You should not feel that these supplements are obligatory for phentermine success. However, when following a reduced-calorie diet, it can be hard to eat a sufficient amounts of nutrients, so some kind of vitamin supplement is usually a good idea.

Furthermore, most people find that the effects of phentermine wear off over time. For this reason we recommend the supplement Phen Caps. As well as being a phentermine alternative, Phen Caps can also be taken alongside phentermine for an added boost. Phen Caps suppress appetite and boost energy but use different ingredients so they activate different mechanisms in the body to provide this effect. And, as they have no side effects, adding Phen Caps to your daily phentermine won’t cause any unwanted problems.

Weight Loss Results

Aside from side effects, the issue of weight loss results is what most new phentermine users want to know about. While it’s difficult to say what is the ‘average’ phentermine experience is, there are some trends which most users experience. Firstly, new phentermine users will generally lose the most weight in the first week. This is due to the patient initiating changes to their diet and water intake, which can ‘shock’ the body into shifting as much as 6 or 7lbs. However, this is often mainly water weight rather than fat loss. Losing less than this is not a sign of failure; all weight loss should be celebrated as it means you are taking steps in the right direction.

After the first week weight loss will even out, with average losses of around 1-2lbs per week being fairly common. Lastly, weight loss is not linear; even when taking phentermine it’s common to experience plateaus and even weeks when your weight may increase. But, weight gain can be due to things like salt intake, water intake, or your menstrual cycle. So, don’t panic; make sure to track your food intake, drink lots of water and you should see a better result next week.

Many phentermine users can also struggle to lose weight after the first month or two. It is actually common for all dieters to experience a weight loss plateau after losing around 5-10% of their bodyweight. This is where incorporating a supplement such as Phen Caps can help to give you and your results a boost. In addition, this advice can help you to work out where you might be going wrong.

Differences between patients means that phentermine results can vary a great deal. It’s important not to compare yourself to others as some people can drop weight very easily; for example, younger users can drop weight quickly, but slow weight loss does not make you a failure. In fact, many new users find the success stories of other phentermine users very inspiring. So, here are some of their top weight loss lessons to help motivate all you newbies out there!


Are you a new phentermine user? Let us know if you have any questions we haven’t answered here by leaving a comment!


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9 Responses

  1. I couldn\’t sleep last night. I am wonderfing If my dose was to strong? My first dose was yesterday.

    • Hello Sarah,

      Insomnia can happen when people are taking phentermine! I can imagine it is not a very nice experience! Unfortunately, I really can’t give you answers as to how long it lasts, and certainly not on dosages, and the reason for this, is that these matters should always be spoken about with a doctor. Everyone taking phentermine reacts different to it, so you really need to see a professional who can test you accordingly.

      However,you can find out more about this topic here:

      I can also suggest you sign up to our Facebook support group

      Let me know if this information helped, or if there is anything else I can do for you! Have a great day!


  2. How long can you take Phentermine before you need to take a break from it?

  3. Started today and very excited. I am 167.9pds, female, and 39yrs old. I am very excited BUT I just experienced total body sweats and diarrhea. Please tell me this will pass so I can continue to stay on the pills.

  4. I am 28 yo/ with a bmi of 54.9, it was 60.2 when I started phentermine in the middle of March. I have lost a little more than 30 lbs and I\’m not sure how many inches, but I have dropped 3 pant sizes. I just wonder if this is normal for phentermine to work so slowly? I was diagnosed with hypothyroidism last year and gained 110 lbs in my pregnancy ( I had my baby in Jan) and I take a synthetic hormone as well as phentermine and my t numbers are in a normal range, but I feel like the weight still won\’t budge, would I even benefit from phencaps at this point? Also I have always had low or normal blood pressure, but since beginning phentermine it usually close to 140/90 or higher, is this normal? Will it stop once I discontinue phentermine?

  5. Been on 30g/day for 11 mos and have lost 80 lbs. I was down 70lbs at the 7 month mark and have slowed since then. My Dr. approved me to stay on it for 12mos, having showed no adverse side effects. Dry mouth & sleeplessness in the first couple of weeks with dry mouth off & on for several mos, but heart rate, blood pressure, & lab results all stayed normal. I have plateaued so I will now begin taking 37.5mg/day to see if we can kick-up weight loss rate without added side effects. I am over 50 & caffeine-sensitive but have had increased energy with no jitters. Phentermine is the ONLY thing that has truly worked for me. Belviq cost $75/mo with 1-2lb loss vs. Phen for <$17/mo with 10lbs loss. I am amazed & beyond thankful for having the results I have had, and wish success to all others taking phentermine.

    • Thanks for sharing your story, Gigi! We wish you the best on the remaining leg of your journey!


  6. I’m just getting started this week. I started with a small dose the first couple of days just to be sure my body would adjust well. Today i took the full dose and drank lots of water. Lov the energy. Not hungry yet. I work nights, 12hr shifts, so i took half the dose at 2 pm and half at 6 pm. I work till 6 am, so I’m hoping it will let me sleep by the time i get home.

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