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How long does it take for phentermine to become effective?

5 doctors weighed in
Dr. Marci Dietrich
Bariatrics
4 doctors agree

In brief: Phentermine onset

Most patients can feel an effect of decreased hunger about 20-30 minutes after taking a dose of phentermine.

In brief: Phentermine onset

Most patients can feel an effect of decreased hunger about 20-30 minutes after taking a dose of phentermine.
Dr. Marci Dietrich
Dr. Marci Dietrich
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