"this is the second time i&#039;ve used phentermine.  after i had my 3rd child, i used it to drop 20 pounds, and 3 years later, i have gained 10 pounds again, so i used it again.  it definitely works, especially with exercise.  you just have to take it easy, because your heart rate does seem faster, and drink tons of water.  i drink about 4 or 5 bottles of water a day when i take phentermine.  i have lost almost 15 pounds in 2 months time - but again, i&#039;ve been working out 2 times a week lifting light weights and 30 minutes of cardio a week.  great product!"