A variety of Phentermine, Pro-Fast SA is generally used to reduce weight in obese patients with certain medical complications when combined with diet and exercise. It is not to be used if you are allergic to the ingredients or other sympathomimetrics, you are taking certain medications such as MAOI inhibitors, you have moderate to severe high blood pressure, an overactive thyroid, glaucoma, heart or blood vessel disease, a severe narrowing of blood vessels, an eating disorder, an agitated state, or you have a history of substance abuse. You should also not use Pro-Fast SA if you are pregnant as risk to the fetus is not known at this time. Pro-Fast should only be used for a short period of time in weight loss and only in severely obese individuals under a doctor’s supervision and with therapy. According to all indications, Pro-Fast SA seems to use a 37.5mg dose.