How can I prevent insomnia

How Long Does Phentermine Insomnia Last, and Why?

, reviewed by
 – Updated May 8, 2023
, reviewed by
 – Updated May 8, 2023
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The instructions for Phentermine mention insomnia as one of the most common side effects. However, there are no long-term studies on how it affects sleep.

If you use Phentermine, can’t sleep, and wonder when this side effect subsides, there is no definite reply, unfortunately. It differs from patient to patient.

Phentermine is a central nervous system stimulant increasing your energy level. It can affect sleep quality. Phentermine insomnia can last from a few days to the first two weeks of the treatment. Then the body adapts to the drug, and sleep should get normal.

How can I prevent insomnia while taking Phentermine

How can I prevent insomnia while taking Phentermine on my own? There is only one answer to the question: change your lifestyle. A healthy diet and moderate exercise may reduce the severity of side effects. Reducing caffeine will also help. It would be better to completely eliminate it and other stimulating energy drinks, including cola.

Here are some simple tips on how to avoid insomnia while taking Phentermine:

  • Take Phentermine in the morning half an hour before breakfast;
  • Increase your daily exercise but reduce it in the evening;
  • Do a digital detox 1-2 hours before going to bed. Put your phone away and take a book you’ve been long putting off;
  • Arrange your bedroom for comfortable sleep: air the room well, use it only for sleeping, and keep gadgets out of the bedroom.

Following these recommendations will make it easy to fall asleep.

How to take Phentermine and insomnia cure safely

If you have insomnia, don’t select a cure and try to determine the correct dose on your own. Only a doctor can tell you how to combine Phentermine and insomnia cure safely. The doctor may decrease the recommended medication dosage or change the dosing schedule according to your needs and health condition.

How to fall asleep on Phentermine without drugs

If you have insomnia after taking Phentermine, it may force you to find ways to get rid of it. Some people decide to seek help with sleeping pills, but if you don’t want to take drugs and want to know how to fall asleep on Phentermine, you should get new healthy habits.

First, you should avoid daytime sleep, even if you are very tired and want to take a nap. You should also give up snacking two hours before bedtime and remove fast carbohydrates from your diet. You should limit caffeine and nicotine to restore normal sleep.

If you like to relax with a cup of coffee, don’t deny yourself this pleasure: try coffee without caffeine. These drinks have the same taste!

Can I take Phentermine and sleeping pills together?

You should take no pills with Phentermine on your own. Otherwise, you can worsen your condition or provoke other side effects. Ask your doctor before taking the drug for the first time: “Сan I take Phentermine and sleeping pills?”

Only a doctor or pharmacist can give you a clear answer because some combinations of Phentermine with sleeping pills can be dangerous. Usually, doctors prescribe melatonin as an additional medication, but the interaction between these two drugs is not fully understood. Taking any insomnia cure with diet pills can lead to an adverse body reaction. So you should agree on it with the doctor.

Why would Phentermine make me sleepy?

Why would Phentermine make me sleepy? It’s simple! The drug has a stimulating effect provoking the release of energy. But after the period of stimulation, a decline and fatigue follow. Along with fatigue, drowsiness appears, which is also one of the side effects of the medicine.

In rare cases, if side effects persist for more than a few weeks, you should consult a doctor. If Phentermine drowsiness doesn’t go away after a couple of months, you should have an additional examination, as this may be a signal from the body that an undiagnosed disease is present.

Is 60 mg of Phentermine too much with insomnia?

The maximum daily dose of the drug is 37.5 mg. So, 60 mg of Phentermine is too much for once. Such a large dose of the medication is unsafe not only for insomnia but also for your health as a whole. Taking the wrong dose of Phentermine can lead to overdose, which is dangerous for its consequences for health.

Using 60 mg of the drug is acceptable only if you take it in several doses for two days at strictly specified intervals. Follow the prescribed Phentermine dosing schedule, and don’t increase the dose without your doctor’s or pharmacist’s permission.

How to sleep while taking Phentermine?

To avoid insomnia and improve sleep quality when taking diet pills, you should change not only your lifestyle but also your sleeping place.

A few simple tips on sleeping place arrangement will teach you how to sleep while taking Phentermine:

  • Maintain a comfortable temperature in the room;
  • Don’t forget to air the room regularly;
  • Change bedclothes;
  • Limit access to TV and other electronic gadgets in the bedroom.

It is especially important to follow the daily schedule and go to bed at the same time.


Phentermine affects the body differently. For some people, it causes insomnia, while others, on the contrary, cannot fall asleep. There is nothing to worry about, so don’t refuse treatment. If the side effect doesn’t go away after a few weeks, you can review the drug’s dosage, which can reduce its effect.

If it is your current issue and you ask “How can I sleep better while taking Phentermine”, note that it is a temporary problem, and you can easily solve it with a healthy lifestyle and a competent daily routine!

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