Phentermine Dangers

Phentermine is a prescription drug approved as a short-term weight-loss aid. Although most people tolerate this medication well, there are potential dangers associated with phentermine use. For example, a number of side effects have been reported with this weight loss medicine. In clinical studies, some of the most common problems that were reported with phentermine included:

Insomnia (see Phentermine and Insomnia)
Hyperactivity
Restlessness
Dizziness
Unusual happy feelings (euphoria)
Unusual unpleasant feelings (dysphoria)
Dry mouth (see Phentermine and Dry Mouth)
Unpleasant taste
Diarrhea
Constipation
Sexual problems (see Phentermine Sexual Side Effects).

Phentermine can also increase your heart and blood pressure, which could cause problems in people who already have high blood pressure or cardiovascular problems. Also, taking this medicine with fenfluramine ("phen/fen") has been shown to cause dangerous side effects, including problems with the heart valves and a lung problem known as primary pulmonary hypertension (PPH).

(Click Phentermine Side Effects and Phentermine Warnings and Precautions to learn about other possible phentermine dangers, including other potentially serious side effects or complications that may occur with the use of this medication.)