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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Why Are Phentermine An OTC Drug & Adipex A Prescription Drug?

Why is phentermine an OTC drug and Adipex is prescription? My husband went to a weight loss clinic and they prescribed adipex. This just concerns me greatly. Phen Phen destroyed people s heart muscle and I m trying to learn all I can. Specifically what are the differences in these two drugs when most sites tout they are practically the same.
Tue, 6 Sep 2016
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General & Family Physician,  's  Response
Hello. Adipex is just a brand name of phentermine and basically both terms are the same drug and neither one is over the counter in the US since it's a controlled substance. The fenfluramine part of the phen/phen mix was the medication that caused heart valve problems, not the phentermine part.
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Why Are Phentermine An OTC Drug & Adipex A Prescription Drug?

Hello. Adipex is just a brand name of phentermine and basically both terms are the same drug and neither one is over the counter in the US since it s a controlled substance. The fenfluramine part of the phen/phen mix was the medication that caused heart valve problems, not the phentermine part.