Amphetamines are stimulant drugs, which means that they increase brain activity and intensify the messages between the brain and the body.
Amphetamines are available in different forms.
The powder form of amphetamine is known as ‘speed’.
Crystal methamphetamine (‘ice’) is a stronger, more addictive and therefore more harmful form of amphetamine. Crystal methamphetamine usually comes as small chunky clear crystals that look like ice.
In contrast, some types of amphetamines are legally prescribed by doctors to treat medical conditions such as attention deficit hyperactivity disorder (ADHD) and narcolepsy.