Phentermine is an amphetamine-like prescription medication used to suppress appetite. This medication helps weight loss by decreasing your hunger or making you feel full longer. It is also available in combination with topiramate for weight loss. Phentermine 15 mg helps to burn your fat so that you can eat less and feel like your stomach is full length. You should not use this medicine if you have allergic to any medicine, have a history of heart disease, uncontrolled high blood pressure, overactive thyroid, glaucoma, extreme nervousness, etc. You should go to your doctor if you feel an allergy after using this medicine.