"i eat fairly healthy and exercise at least 3 times a week however my weight wasn&#039;t dropping so i went to my doctor. he prescribed phentermine 37.5 mg and i have been taking it every morning before breakfast. the only side effects i noticed was the dry mouth, but it just encouraged me to drink more water. didn&#039;t have any problem sleeping, irritability or pounding heart like others have described. i go back to my doctor in 2 weeks for my 30 day review. i&#039;m down from 206 to 195 so far."