Question: What are the long-term side effects of using phentermine. Can it make you fatter?
Dr. Hibberd's Answer:
Phentermine is an appetite suppressant similar to amphetamines. It can be addictive and is a class IV controlled substance. Appetite suppression often disappears by 12 weeks, and weight gain thereafter is not uncommon. Also not uncommon is tolerance to the drug along with its attendant withdrawal problems. There are no long term studies that support its safe use for weight maintenance or weight loss.
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