A member asked:

Is it normal for phentermine to make me overwhelmingly tired?

A doctor has provided 1 answer

Phentermine effects: Since Phentermine is a stimulant used to suppress appetite and help weight loss, it is unusual to cause fatigue. However, if you are on an aggressive weight loss or diet program, then can cause fatigue if weight loss is thru excess restriction of carbohydrate calories. Also, in some cases, the Phentermine can cause sleep issues and this can lead secondarily to daytime fatigue.

Answered 2/10/2021

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