Hi, Welcome to Healthcare Magic Forum. Amphetamine is a stimulant and an appetite suppressant. It stimulates the brain by increasing the amount of certain chemicals in the body. This increases heart rate and blood pressure and decreases appetite. It is used to treat Day time sleepiness. You can become physically and psychologically dependent on this medication, and withdrawal effects may occur if you stop taking it suddenly after several weeks of continuous use. Talk to your doctor about stopping this medication gradually. You are becoming Physically and psychologically dependent on it. It causes insomnia, so do not stop it without consulting your Doctor.