As we all expected, there should also be a side or a negative part in what concerns this diet pills. phentermine 37.5 is not as safe and wonderful as we expected. As any other diet pills, it will damage our body in a way or another, changing its normal curse. Drowsiness, diarrhea, sedation and despair are the simple and not those harmful negative parts of this drug, beside this; you can experience pulmonary hypertension and insomnia. You have to consult a doctor before you actually kill yourself.