Phentermine is widely available as: (a) a capsule containing 15 mg, 30 mg or 37.5 mg of Phentermine hydrochloride (equivalent to 12 mg, 24 mg and 30 mg respectively of Phentermine base) and (b) as a tablet containing 37.5 mg of Phentermine hydrochloride (equivalent to 30 mg of Phentermine base).

Phentermine 37.5 tablets and capsules are indicated as a short term (no more than a few weeks) adjunct in a regimen of weight reduction that is  based on exercise, behavioral modification and restriction of calorie intake in the management of obesity for certain patients.

Phentermine 37.5 is the strongest available phentermine dosage.