Another name for Phentermine, Oby-Trim is a form of the Phentermine hydrochloride variety. It is a stimulant similar to an amphetamine, working as an appetite suppressant by affecting the central nervous system. It is meant to be used with a plan of diet, exercise, and counseling to achieve the greatest results for those suffering with morbid obesity coupled with related health risks such as high blood pressure, high cholesterol, and diabetes. I may cause serious side effects and it can be habit forming. However, Oby-Trim only works for a few weeks before its effectiveness fades away and it may even cause sudden and severe weight gain in some individuals. If you suffer from heart disease, high blood pressure, arteriosclerosis, an overactive thyroid, glaucoma, if you are in an agitated, state, if you have a history of eating disorders, or if you have a history of drug or alcohol abuse, you should not take this drug.