Crystal meth is the common name for crystal methamphetamine, a strong and highly addictive drug that affects the central nervous system. There is no legal use for it. Also called “ice” or. Meth reduces the amount of protective saliva around the teeth. Meth users also consume excess sugared, carbonated soft drinks, tend to neglect personal hygiene, grind their teeth and clench their jaws, leading to what is commonly called “meth mouth.” Meth is a stimulant drug that can cause brief but intense euphoria and poses a high risk of addiction. Learn its effects and how to get treatment. Meth addiction causes destructive transformations, serious health issues, disabilities, and failure to keep up with personal responsibilities. Meth is a highly addictive drug with potent central nervous system (CNS) stimulant properties. Those who smoke or inject it report a brief, intense sensation, or rush. Oral ingestion or snorting produces a long-lasting high instead of a rush, which reportedly can continue for as long as half a day. Methamphetamine, a derivative of amphetamine, is a powerful stimulant that affects the central nervous system. Amphetamines were originally intended for use in nasal decongestants and bronchial inhalers and have limited medical applications, which include the treatment of narcolepsy, weight control, and attention deficit disorder. Methamphetamine is a lab-made (synthetic) stimulant with high addiction potential. When sold as shiny bluish-white rocks or crystals, it may be called “crystal meth,” “Tina,” or “ice.” Methamphetamine’s short-term effects typically include feelings of euphoria and increased alertness and energy. It affects chemicals in the brain and nerves that contribute to hyperactivity and impulse control. Methamphetamine is used to treat attention deficit hyperactivity disorder (ADHD). Methamphetamine is also to treat obesity in people who have not lost weight with diets or other treatments. Stimulant that speeds up body’s system that comes as pill or powder. Available in prescription as Desoxyn® to treat obesity and ADHD. Crystal meth resembles glass fragments and is an illegally altered version of the prescription drug that is cooked with over-the-counter drugs in meth labs. l-METH, a vasoconstrictor, is the active constituent of the Vicks Inhaler decongestant (Procter & Gamble, Cincinnati, OH), an over-the-counter product containing about 50 mg of the drug (Smith et al., 2014).