Can Phentermine cause hair loss? 

Can Phentermine cause hair loss? 

Phentermine can cause hair loss in some people, but the side effect is considered a rare one. The exact reason why some people experience hair loss on this medication is still unknown. 

However, the experts suggest that the use of this medication among people who wish to lose weight is usually paired with dietary restrictions to make Phentermine effective and this restriction may make you nutrient deficient (1).

This nutrient deficiency can make your hair weak and you may start to experience hair loss. It can also cause disturbing headaches.

Is Phentermine-induced hair loss reversible? 

Yes, Phentermine-induced hair loss is considered reversible, but it could take a very long time. Several surveys have revealed that some people may start to recover earlier or when their bodies adjust to the medication. 

However, some people may continue to experience hair loss as long as they take Phentermine, or even much longer after the drug is discontinued. It depends on your nutrient intake and the overall recovery rate of your body.

Phentermine may also cause some other rare or uncommon side effects, like tightness of the chest, breathing difficulties, affected libido, unexplained weight changes, etc. Make sure you keep an eye on your side effects and report them to your doctor.

How to reverse hair loss on Phentermine?

If you’re losing a lot of hair on Phentermine, talk to your healthcare provider. Your doctor can determine if it’s safe for you to continue using this medication or not. However, there are some tips that you can try to enhance your hair loss reversal:

  • Add protein to your diet. Proteins are the building blocks of your body and they can significantly help you recover from hair loss. 
  • Don’t forget good fats – Omega-3 and 6 fatty acids. Healthy fats are essential for your normal growth and development and they will most likely speed up the recovery process. 
  • Try multivitamins. Vitamins are not something your body makes on its own they are taken through our daily diet. If your diet is restricted, you can try adding supplemental multivitamins to your daily routine. 
  • Do not apply harsh chemicals on your hair in the form of shampoo, conditioner, hair dye, serums, etc. Such chemicals can damage your hair and weaken your hair roots, causing the hair to fall off. 

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National Library of Medicine (US). Phentermine. Bethesda (MD): U.S. National Library of Medicine; 2021 Mar 15 [updated 2021 Mar 15; cited 2022 Nov 9]. Available from: