What Are The Weight Loss Stages with Phentermine?

Weight Loss Stages with Phentermine

One of the biggest concerns for anyone taking phentermine is whether their experiences are ‘normal’; that is to say, that the side effects, weight fluctuations, and all the other reactions in between that they are going through or about to go through are similar to those experienced by other people who have taken phentermine. 

A great way to interact with others taking phentermine is to join in on the conversation in the Facebook support group.

Still, as a general guide, we’ve put together this breakdown of the weight loss stages with phentermine that is commonly experienced during a three-month cycle, including how to get yourself ready for them and how to make the most of your prescription!


Like getting ready for a trip or a new job, you want to be prepared for a successful start to your weight loss journey.

You should look into phentermine beforehand so that you know what to expect, and come to our support group to introduce yourself as a new member to get great advice from others if you’re unsure about something.

Regarding weight loss, being prepared also means setting goals and working out how to achieve them, which will involve changing bad habits for good ones and cooking healthier meals while also getting more active and finding an exercise that you love.

Stage 1: Side Effects

Unfortunately, for many people taking phentermine, the first few days and possibly weeks can be a struggle due to the side effects of phentermine, which can include insomnia, nausea, dizziness, headaches, constipation, anxiety, and mood swings.

It’s a time when you should be losing weight, but if you’re not feeling great, then it can be particularly hard on you and your body; this advice on how to overcome the side effects should help you with the toughest days at the start.

However, the most common side effect by far is dry mouth, which was reported by 74% of over 1,200 users in a poll. 

As a solution to this symptom, we recommend Phen Drink, a soluble powder that is added to drinking water to increase saliva flow and stop the dry mouth side effect.

What’s more, Phen Drink also contains ingredients that actually help to boost your weight loss potential by increasing metabolism and suppressing appetite, meaning that with the help of Phen Drink, your eight glasses of water a day will be working even harder to help you succeed on your weight loss journey.

Stage 2: Initial Losses

Initial Losses

During the first few weeks, as well as the negative effects of phentermine, you’ll also feel the effects of appetite suppression and additional energy at their most powerful stage.

It’s possible that you could see some big losses in the first few weeks, partly due to losing water weight and partly because your motivation and energy levels will be at their highest.

However, it is important that you follow a routine based on exercise and healthy eating for life and avoid fad diets or starving yourself, as, in addition to reaching your weight loss goal, you should be aiming to develop a healthy relationship with food while you’re losing weight with phentermine.

If you’re not feeling the effects as strongly as you’d hoped, then these tips on how to maximize the efficacy of phentermine should help to give you the kickstart you need.

Stage 3: Consolidation

Whether or not you experienced some big losses at the start, these drops are not sustainable in the long term.

Your body can only physically shed around 1-2 lbs of fat per week, so it’s likely that your losses will begin to reach a steadier rate in this second stage, but this is a positive step as steady weight loss ensures that you’re losing fat and building muscle as a means to achieving and maintaining your weight loss goals for life.

This stage also reflects a consolidation of your new, healthier routine, when it becomes easier to plan ahead with shopping and cooking healthy meals, and where you will have found an exercise or sport that you enjoy and can fit into your new routine.

You should also be experiencing fewer side effects as your body becomes more used to phentermine and its effects.

However, you should always be pushing yourself to work that bit harder or at least to do something different from week to week, whether it’s changing your running route or experimenting with new vegetables; make sure you don’t get bored or complacent as this is when cravings can catch us off guard and slip-ups can happen.


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Stage 4: Decreased Effects

At this stage, you also may experience a weight loss plateau and struggle to lose anything.

Still, you should also remember that if you’re building muscle by doing weight-bearing exercises, then the scale may be hiding the truth, which is that you could be toning up and losing fat without this necessarily showing on the scale.

That’s why it’s important to focus on other changes and improvements you’ve made, such as fitting into smaller sizes or managing to beat your own running time.

You may also feel like the effects of phentermine have decreased, but following these energy-boosting tips and this advice on how to suppress your appetite should help get you through this last phase of your phentermine prescription.

If you feel like you need an extra boost, then adding the weight loss supplement Phen Caps can help to get you back on track with your weight loss journey. Phen Caps are the leading phentermine alternative and can be taken alongside phentermine to give extra appetite suppression and energy-boosting effects to your prescription.

The serotonin pre-cursor 5-HTP has also been found to boost the effects of phentermine, so adding a multivitamin with 5-HTP, such as Phen Vites, can help to restore the strength of your phentermine.

Phen Vites also contain other essential nutrients and vitamins which are crucial to both weight loss and the efficient functioning of the body, as they help to boost metabolism and level out blood sugar levels.


Phentermine is typically only prescribed for up to 12 weeks at a time.

It is intended as a short-term aid to help obesity and, if used correctly, should ensure long-term weight loss by incorporating healthy lifestyle habits.

Following the first three months, your phentermine doctor may require you to take a break from phentermine for at least a month, but this can be more in some cases.

It is important for patients to take a break from phentermine to avoid addiction or withdrawal symptoms as much as possible, as well as to ensure that the body is not put under undue pressure while taking phentermine for extended periods.

However, you don’t have to go it alone on your break; the phentermine alternative, Phen Caps, offers you the opportunity to continue benefiting from a suppressed appetite and an energy boost to ensure that your weight loss journey can successfully continue far beyond your phentermine prescription and lead you to the goals you want to achieve!

What stage are you at with phentermine? Whether you’re just starting out or a phentermine pro, we want to hear your feedback on your experiences with phentermine, so please feel free to comment below.

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  1. Has anyone experienced swelling of mouth? I also experience it when the allergens I am allergic to cause the same problem.

  2. Hi! I have been on phentermine since January 19, 2015. I am fixing to go on my break. Phentermine has given me the opportunity to work on portion control while changing my way of eating to total healthy. I have lost 35 lbs and feel so much better even with hypothyroidism.

  3. Hey Blair, great to hear that you’re doing so well on phentermine! Keep drinking that water and you’ll boost your losses even more! Good luck!

  4. I started Phentermine on September 1st. Had my follow up appt with my doctor today. I am down 14 lbs. I love it. My clothes are lose on me. I feel great. This is the boost I needed to get started with changing eating habits. Haven’t had any side effects until last night and tonight. I tried to drink a coke last night and tonight. It has made me feel nauseous. All I’ve been drinkingb is water. I think that’s all I’m going to drink.

  5. Hi! I’ve tried taking this a couple times. I can deal with most the side effects but the nausea is too much. Do you have a suggestion? Like should I eat with it? Or not eat? Take in the morning? Take at night?

    1. Hi there Kathie, Thanks for your comment! 🙂

      The best advice I can give you, is to speak to your doctor first, that is always #1 since everyone is different. I can also recommend that you join our FB support group, our users discuss all different topics with weight loss and phentermine as well as give great support to each other. You can check it out by clicking here!

      I hope this helps, let me know if you have any other questions, I am happy to help!

      Sally, Phentermine.com

  6. I’m on day 2 of phentermine. Only sidw effect is the inability to sleep soundly. I get to sleep, but very light sleep and only for a few hours. I am experiencing a slight headache, but I think this is due to quiting caffeine cold turkey on day one!. Im super excited to see the results I achieve. I’ve read a lot of great testimonies and I know a few people personally who have had great success. .

    1. Hi there Sandra, Thanks for the comment!

      Sounds like you’re on a great track so far, congratulations! If you feel something is not going as you expect, make sure you consult your Dr, otherwise you can check out our Facebook support group. In this group users discuss all different topics to do with phentermine and weight loss, so you can find a lot of tips, advice and support there, too.

      Good luck with your weight loss and please keep us posted, we are rooting for you!

      Sally, Phentermine.com

  7. I just started on Wednesday and so far I only seem to be waking up a few extra times a night. I also need some help with the diet .

    1. Hi Linda, Thanks for the comment,

      If you have any questions about your medication, be sure to speak with your Dr first, as they will know what is best for you. Otherwise, you can check out an article about healthy meals to eat while on phentermine by clicking here.

      I hope this helps, let me know if you need anything else, I am happy to help!

      Sally, Phentermine.com

  8. I just started my first day on phentermine and can’t wait to see how this can help me get to a weight that I can maintain.

    1. Hey Melissa, Thanks for the comment 🙂

      Congrats are beginning your weight loss journey! You can find lots of tips, support and information in our Facebook support group!

      Also, if you’re looking for an extra boost to your weight loss, you should check out these 3 great products here.

      Hope this helps, Have a great day 🙂

      Sally, Phentermine.com