"i took phentermine and ended up with open heart surgery...i had success with the drug but eventually developed fluid around my heart which turned into a gel causing my heart liner to be glued to my heart and i couldn&#039;t breath and it took 2 months for the doctors to find it because my ekg and oxygen levels were fine, i went to the emergency room and an mri found it right away, they had to do open heart surgery and peel my heart liner off my heart. i was exercising and was the healthiest i had been in years, running 6 miles a day and riding my bike 20 miles and all of a sudden i just couldn&#039;t breath and was so tired. now 4 years later i can not run or do any aerobic type of exercise because i get to out of breath. stop taking this drug!!!"