Amphetamines are a stimulant drug that increase your energy and have been found to benefit Narcolepsy and Depression. They can be used to control the excessive daytime sleepiness you may be suffering from. Amphetamines are a prescription drug, therefore you will need a diagnosis from a doctor before beginning to take these and the doctor will prescribe the correct dosage. Amphetamines are also thought to decrease appetite, and should you find that this is the case then you should contact your doctor for alternative medication.