phentermine stopped working

Has Your Phentermine Stopped Working?

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Check out the ultimate guide to phentermine weight loss pills!

Phentermine is known to be an extremely effective weight loss medication. However, for those taking phentermine, the effects and results can vary throughout their prescription, and many of our forum users report that they feel their phentermine has stopped working, sometimes just a week or two after first starting to take it. Here we examine how phentermine works, what can cause a reduction in its effects, and how to overcome these issues in order to achieve great phentermine results.

How Phentermine Works

Phentermine acts on the central nervous system to stimulate the release of neurotransmitters in our brain, including dopamine, epinephrine (adrenalin) and norepinephrine (noradrenalin). This causes phentermine to increase alertness and energy levels, reduce hunger and minimize cravings. By helping to suppress appetite, phentermine encourages you to establish a healthier diet; with reduced cravings and less hunger, you will be able to concentrate on eating better and learning how to feel full while eating fewer calories by loading up on protein, fiber and lots of fruit and veg. Additionally, with the extra energy that phentermine gives due to its stimulant properties, you’ll feel more motivated and better able to begin exercising, establishing a daily routine of activity to continue in the long term.

Phentermine Weight Loss Stages

If your hunger has started to come back or your energy levels have started to dip, your first instinct may be to wonder, has phentermine stopped working for me? However, phentermine effects, and the subsequent phentermine weight loss, come in stages, so it is perfectly normal to experience a reduction in phentermine effects and smaller losses. This is because the sustained use of many drugs causes adaptation within the body that tend to lessen the drug’s original effects over time, known as drug tolerance. Many phentermine users experience a reduction in effectiveness of the medication over time, which indicates that tolerance is occurring within the body. This is often the case for those who have taken phentermine in the past when they return to taking it again.

When you first start taking phentermine, as well as the negative side effects, you’ll also feel the desired effects of appetite suppression and additional energy at their most powerful. Therefore, it’s possible that you could see some big losses during this period, partly due to losing water weight and partly because your motivation and energy levels will be at their highest. However, after the first few weeks, 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 pounds of fat per week, so it’s likely that your losses will begin to reach a steadier rate in this second stage. If you’re losing weight while toning up and building muscle, this is a positive step as steady weight loss ensures that you’re losing fat and gaining lean muscle as a means to achieving and maintaining your weight loss goals for life.

Has Your Phentermine Stopped Working?

You may think that phentermine has stopped working for you if you feel your hunger returning, however the appetite-suppressing effects of phentermine will change over time; perhaps at first you had to force yourself to eat, as many of our forum users have reported, but these extreme effects will only last for a few days if you experience them at all. While it may seem that struggling to eat anything is a good thing if you’re trying to lose weight, as with most things in life, balance is essential when it comes to appetite, and neither too much nor too little is a good thing. With no appetite, you will be unable to eat enough to keep your metabolism running at a fast enough rate, and without the fuel it needs, your body will slow down, meaning that any food you do eat will not be turned into energy as efficiently by your body, resulting in slower weight loss.

Even if you do manage to successfully lose weight on phentermine while eating very little, when your prescription comes to an end you will regain your appetite and, without having learned healthy eating habits, you are most likely to regain the weight you lost as well, as reported by this forum user. Therefore, a reduction in the extreme appetite suppression you felt at first is actually a positive thing and doesn’t indicate that your phentermine has stopped working. Remember that phentermine isn’t a miracle pill, it is just a kick-start to get you on the right track, and so you should treat your phentermine prescription as your opportunity to benefit from decreased hunger and increased energy to learn how to establish healthy habits for when your phentermine prescription comes to an end. A good way to put things into perspective is to think back to what you used to eat and what you’re eating now, and imagine how hungry you would be without phentermine on a low calorie diet, as this forum user explains. If you think that phentermine has stopped working, you may just have forgotten how strong your appetite used to be.

If you’re more concerned about your losses slowing down, then you should remember that the scale doesn’t always tell the whole truth; the scale doesn’t show the inches you’re losing and the new shape you’re working towards, nor that you’ve reduced your body fat ratio and built muscle this week. For this reason, old photos, old ‘fat’ clothes and a tape measure are your best weight loss weapons to remind yourself how great you’re doing. And, you should always keep in mind that the feeling of finally fitting into that pair of skinny jeans you’ve had in your wardrobe for years will be a million times better than seeing a number on a scale!

phentermine stopped working

How To Boost Phentermine Effects

Drinking plenty of water, regular exercise and eating the right foods will help to boost the effectiveness of your phentermine prescription, plus aiming for an alkaline pH also ensures that phentermine remains in your system for longer, therefore offering you stronger and longer-lasting effects, as explained here. This phentermine weight loss schedule also offers lots of great advice on how to make sure your phentermine prescription is continuously working for you throughout the day, and these tips will help you overcome a weight loss plateau if your weight loss stalls.

If you think that your phentermine has stopped working because you’re not feeling the energy boost you did at the start, this can also be due in part to the natural reduction in phentermine effects that occurs over time as your body becomes more used to the medication. However, if you’re lacking in energy or more fatigued than before, this could be as a result of the phentermine side effect of insomnia, or could be due to an energy dip following a period of over-stimulation. However, adverse effects of phentermine also include drowsiness, fatigue, and reduced energy levels, as discussed on the forum here and here, which can occur alongside or instead of symptoms such as insomnia. These reactions, whereby a stimulant such as phentermine causes fatigue and sleepiness without an energy boost are called paradoxical reactions, and are more common than many realize. This fatigue could be a passing side effect, or may be as a result of an undiagnosed medical condition such as diabetes, thyroid problems or PCOS. It could, however, be something as simple as a vitamin deficiency; for example, low levels of magnesium can cause tiredness, as can insufficient levels of vitamin C. To counteract these problems with fatigue while also ensuring that you are getting the right amount of crucial nutrients, and simultaneously giving yourself a great weight-loss boost, we recommend that you take Phen Vites, the only multivitamin especially designed to help those taking phentermine. This multivitamin complex contains a multitude of essential vitamins and minerals for good health and more effective weight loss, as well as nutrients specifically prescribed to phentermine users to boost their loses, such as 5-HTP and vitamin B12.

We also recommend adding the weight loss supplement Phen Caps to boost the effectiveness of your phentermine prescription by offering additional appetite suppression and an extra energy boost. This leading phentermine alternative uses a combination of different active ingredients to provide your body with a different source for these effects when your body becomes accustomed to phentermine. It is important to always follow the instructions of your doctor, so if you find that your phentermine prescription does not produce the same effects, you should not increase your dosage in an attempt to manage your increase in tolerance. Doing this will only lead to a greater dependency and therefore a greater chance of withdrawal symptoms, including weight gain, once your prescription ends.

Do you think that phentermine has stopped working for you? Or do you have any advice for how to overcome the reduction in phentermine effects? Let us know by commenting below.


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123 Responses

  1. Hello, i started 15 mg of phentermine August 2017 and weighed 187 pounds . I lost about 15 pounds only so
    My doctor raised it to 30 Mg February 2018 . It is now June and I weigh 165. I haven’t lost anything since April. It’s now around the time , I’m going to be on this for a year . 25 pounds in total is good but wasn’t what I had hoped . I hoped to be at least at 150 by now . I also read that I can’t be on this over a year and i started last August . So any suggestions without taking phen caps or anything that would involve increasing my heart rate . I have hypothyroidism . Thanks in advance

    • I have been on Phen 37.5mg for a month now and to have lost 2lb. They dont make me feel any different or surpress my appetite I actually sleep better on them too ?

  2. Hypothyroidism? Are you on thyroid medication? Just wondering, because I am taking thyroid medication and Phentermine has stopped working for me at month four.

    • Hi Susan 🙂 It’s common for phentermine to decrease in effectiveness after about 12 weeks (3 months) due to the nature of the medication – independent of thyroid function. If you feel like the pills aren’t working as well anymore, it may be worthwhile to chat with your doctor about a short break from phentermine. Best wishes!

  3. I lost 17lbs the first 2 weeks. Now 3 weeks later I have not loat anymore weight. It doesn’t suppress my appetite but I eat less anyay. I do not have energy. I drink lots of water and I’ve been constipated for over a month. I’m disappointed

  4. Im at month 4 of my phentermine journey and im down 42lbs it has slowed down the effects but Im going to try the tips they suggested to boost my phentermine ,,,Im very happy with the results and id recommend it to anyone without hart problems

    • Hi Kay, thanks so much for your comment. Congrats on your success so far!! Keep up the great work 🙂

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