A member asked:

What's the difference between fastin (phentermine) and fastin (phentermine) xr?

A doctor has provided 1 answer
Dr. Gregg Nishi answered

Specializes in Bariatrics

Fastin (phentermine) XR: Fastin (phentermine) xr is just the extended release version of fastin (phentermine).

Answered 12/16/2019

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