Methamphetamine, a derivative of amphetamine

Methamphetamine, a derivative of amphetamine, is a powerful stimulant that affects the central nervous system. Amphetamine was originally intended for use in nasal decongestants and bronchial inhalers and has limited medical applications, including the treatment of narcolepsy, weight control, and attention deficit disorder. Methamphetamine can be smoked, snorted, orally ingested, or injected. It is accessible in many different forms and may be identified by color, which ranges from white or yellow to darker colors such as red or brown. Methamphetamine comes in a powder form that resembles granulated crystals and in a rock form known as "ice", which is preferred by those who smoke methamphetamine. According to the National Institute on Drug Abuse (NIDA), users have been known to use cocaine, marijuana, morphine, and alcohol in combination with methamphetamine.