"my doc started me on phentermine 15mg because i have high bp and she was worried about it. my first month on the medicine i didn&#039;t feel any different but did lose 7lbs. she just gave me phentermine 37.5mg and today is my first day taking and let me tell you i have a ton of energy and have a hard time staying still! not complaining! looking forward to this weight loss journey and will post after my first month on 37.5mg"