Even though many believe Adipex to be a safe drug, still you need to consult doctor before taking this pill. According to the Adipex reviews, the medicine may cause you impotence, constipation, headache, dizziness, dry mouth, diarrhea, sleeplessness, upset stomach etc. This is not meant for people who suffer from high blood pressure, anxiety, uncontrolled diabetes, or those who are taking other diet pills.