tired on phentermine

As well as an appetite-suppressant, phentermine is meant to be a stimulant, giving you extra energy to help motivate you into being more active in your daily life. However, not everyone experiences this energy boost; many phentermine users contact us and use our phentermine forum to explain how they actually feel more tired on phentermine. Here we explain why some people can experience tiredness when taking phentermine, and what can be done to overcome this problem.

Why Am I Tired On Phentermine?

While many people experience a boost of energy, and even side effects such as jitteriness and feeling ‘wired’ while taking phentermine due to its stimulant effects, others can have a very different reaction. Forum posts show phentermine users reporting that they feel sleepy or mentally and physically exhausted while taking phentermine, indicating that it is producing the opposite of the desired energy-boosting effect. So, why exactly are people reporting that a stimulant is making them more tired?

1. Insomnia

As a stimulant, phentermine can sometimes work too well, meaning that users can suffer from insomnia. This side effect leaves them wide awake late into the night, despite taking their phentermine first thing in the morning. So, one logical conclusion as to why those on phentermine report feeling tired would be that the medication has caused an over-stimulation of neurotransmitters, leaving them alert and unable to sleep despite their tiredness.

However, this implies that the patient has experienced this initial burst of energy expected from phentermine, and that their tiredness is more as a result of an inability to sleep due to over-stimulation, rather than as a direct result of the phentermine medication. But, forum posts and blog comments indicate that insomnia is not always the cause of feeling tired on phentermine. In fact, some people have reported that they feel sleepy and need to take several naps per day when taking phentermine, including just after taking it, and others describe feelings of exhaustion despite sleeping well at night, as shown in the comments on this blog article in particular.

2. Paradoxical Reactions

So, there must therefore be another explanation as to why people feel tired on phentermine; namely, paradoxical reactions. It has been well-documented that stimulants can cause people to experience fatigue, drowsiness and reduced energy levels – the very opposite of what would be expected from a stimulant. In addition to more common stimulants such as caffeine, which has been shown to cause this effect, phentermine has shown to leave people feeling drowsy and tired, which can occur alongside or instead of symptoms such as insomnia. These paradoxical reactions, whereby a stimulant causes fatigue and sleepiness without the anticipated energy boost, follow a mechanism that is not completely understood, even by researchers and medical experts, but are much more common than people realize.

One theory to explain this is that, since phentermine stimulates several receptors, including serotonin, it can cause feelings of tiredness and fatigue as serotonin is released as the body’s way of regulating sleep. Alternatively, it may be that the pre-existing balance or imbalance of chemicals in the brain on a particular day are the trigger for what effects the phentermine will have on that particular patient, in the sense that it may correct an imbalance or over-stimulate a certain chemical, leading to somewhat unpredictable reactions. This also indicates that you may not always have this reaction to phentermine and that this side effect may be temporary, as with many phentermine side effects.

tired on phentermine

How To Overcome Tiredness On Phentermine

If you’re feeling drowsy or tired on phentermine then you might want to fight this tiredness by downing coffee, but it’s best to avoid additional stimulants. If you’re in a position to be able to take a short nap, this should give you a much-needed burst of energy to get you motivated for the rest of the day. If you’re at work or too busy for a siesta then these ways to boost energy on phentermine, such as drinking more water, stretching, or going outside for a quick breath of fresh air, should help to keep you going until you can rest.

As with many phentermine side effects, patients usually experience these issues of tiredness most severely at the start of their prescription. So, if you’ve just started taking phentermine and you’re suffering from fatigue or feeling sleepy, then this side effect should pass within the next week or so. While you are experiencing this paradoxical side effect, you may want to reduce your phentermine dosage to see if this helps you to feel more awake and motivated, but in general, getting plenty of weight-loss boosting sleep, lots of water and a variety of healthy fresh foods should help you to feel less tired on phentermine. And, if you feel able to get some exercise, then this will actually help to get your energy levels up, especially if you participate in an energizing and uplifting cardio activity like aerobics or Zumba.

However, if you’re feeling fatigued or lacking in energy while taking phentermine and the problem persists, you should consult your doctor as it may be that you have an undiagnosed medical condition such as 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 you’ll need if you’re serious about losing weight. Phen Vites contain a multitude of essential vitamins and minerals for good health and more effective weight loss, as well as nutrients specifically given to phentermine users to boost their losses, such as 5-HTP and vitamin B12.

Lastly, if it’s just a case of phentermine not giving you as much energy as you had hoped, then adding the weight loss supplement Phen Caps to your daily phentermine will give you an added boost of energy, as well as helping to curb your appetite too!

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Are you feeling tired on phentermine? Let us know by commenting below!

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6 Responses

  1. I Just started and I’m experiencing heavy drowsiness mixed w/ small amt of anxiousness. I also have noted a residual headache starting when I don’t take the nap. Yesterday I combated it by drinking a caffeinated beverage but I’m trying to get away from those drinks to aid weight loss. This is very confusing.

  2. I took Phentermine a couple years ago and it worked great! No side effects, energy levels were super high, weight loss was great etc… This time around after I was done breastfeeding I was put on it and it’s really bad.

    Symptoms include:
    *Tired
    *Drowsy
    *No weight loss
    *Hungry
    *Jitters

    I get 8-9 hours of sleep and those are the sleep hours I’ve needed my whole life to feel well rested. I drink AT LEAST 64oz of water, I’ve tried coffee to see if that helps (helped somewhat). I was Dx with Hypothyroidism but it’s in range and I do take my Synthroid as prescribed (this is the only change from when I took it last).

    • Yesenia, I would like to keep in contact with you as are symptoms and DX and the same . Email me tmills183@gmail.com

  3. I took Phentermine a couple years ago and it worked great! No side effects, energy levels were super high, weight loss was great etc… This time around after I was done breastfeeding I was put on it and it’s really bad.

    Symptoms include:
    *Tired
    *Drowsy
    *No weight loss
    *Hungry
    *Jitters

    I get 8-9 hours of sleep and those are the sleep hours I’ve needed my whole life to feel well rested. I drink AT LEAST 64oz of water, I’ve tried coffee to see if that helps (helped somewhat). I was Dx with Hypothyroidism but it’s in range and I do take my Synthroid as prescribed (this is the only change from when I took it last).

  4. I took my first dose of phentermine 37.5 mg today. I was nervous about taking a new medicine and thought it may cause my anxiety to kick in. In fact, the opposite happened. Within 45 mins I was so tired I couldn’t keep my eyes open and I slept about 9 hrs. Straight. I do, however, suffer from hypothyroid like the above post. I am also on synthroid, but I will be getting lab work done soon to make sure my levels are still good, as I have had to up my dosage 5x my thyroid was 15.88 and was supposed to be between 0. And 4. So, mine was off the charts. I do feel like my appetite is gone ,so it is working. I think it might be my thyroid. We will see as soon as labs come back!!

  5. I have been on phentermine 37.5 MG for about 6-7 weeks. I have been tired to the point of being foggy and groggy at work. I have even tried extra water, exercise, sleep and nothing helps me. I have even tried taking it at night so in the morning I would be less drowsy. I take blood pressure medicine, anti-depressants and multi vitamins. I wish it had worked for me but I have been off it for 3 days and I feel way better, so I am going to my doctor tomorrow to let them know.

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