Phentermine is an effective drug prescribed for treating obesity (overweight) and preventing the risks that may arise in cases of obesity, like heart problems or diabetes. Phentermine is an appetite suppressant, which means it affects certain chemicals in the brain that control the feeling of hunger. Thus, Phentermine directly stimulates the patients to lose weight because it makes them eat less. When prescribed with certain diets and exercises, Phentermine has proven to be highly effective in solving overweight problems. It’s a much healthier alternative to painful surgeries and many people have already lost weight thanks to Phentermine.