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Why is phentermine prescription-only?

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Phentermine is prescription-only because it is structurally similar to amphetamine and is therefore classed as a controlled substance, which means that it is not advisable for people to take it without first having seen a doctor. The doctor can then make sure that phentermine is suitable for you and will not cause any harmful effects, in addition to monitoring your reaction to phentermine and the progress you make during follow-up consultations.