"i was prescribed phentermine by my psychiatrist because i gained 30 pounds on saphris (which i use to help me sleep). i&#039;ve been on phentermine for over 3 months now and i&#039;ve already lost the 30 pounds and then some, i&#039;ve gone down 2 pants sizes with the only side effect being occasional dizziness, which is a small price to pay! i highly recommend it for rapid weight loss!"