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How long can I take phentermine for?

Phentermine is potentially habit-forming and should only be taken for three months at a time. This recommendation is based on the original drug trials in which participants were monitored over a three-month period, and safety of longer medication use was not assessed.

However, in some US states, doctors are able to prescribe phentermine for longer periods, or to prescribe it several times within a certain period with month-long breaks between each period.

Learn more about phentermine. 

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