what are amphetamines

Amphetamines are a class of stimulant drugs that speed up the messages traveling between the brain and the body. Some types of amphetamines are prescribed by doctors to treat conditions such as attention deficit hyperactivity disorder (ADHD) and narcolepsy, while others are produced and sold illegally. They can be in the form of powder, tablets, crystals, or capsules, and are often swallowed, injected, or smoked. Common street names for amphetamines include speed, uppers, ice, and crank. Amphetamines can have various effects on the body, including increased body temperature, blood pressure, and pulse rates, as well as insomnia and loss of appetite. Chronic abuse of amphetamines can lead to psychosis and addiction