Amphetamines are stimulant drugs, which means they speed up the messages travelling between the brain and the body.
Amphetamines can treat conditions such as attention deficit hyperactivity disorder (ADHD) and narcolepsy (where a person has an uncontrollable urge to sleep). Amphetamines have also been used to treat Parkinson’s disease.
Methamphetamine is a potent central nervous system stimulant that is mainly used as a recreational drug and less commonly as a second-line treatment for attention deficit hyperactivity disorder and obesity.
Mephedrone is a recent designer drug, commonly referred to as bath salts, and is one of the most popular recreationally used new psychoactive substances. Like MDMA, it shares similarities with stimulants and with hallucinogens, and psychopharmacological research indicates that it is similar to stimulant drugs, such as amphetamines. Although it has been popularized as a safer alternative, there are medical risks associated with this drug, and the risks are similar to those of amphetamines.