The use of cannabis is certainly very widespread but most users do not move on to other drugs. Amphetamines Amphetamines, also known as speed, produce euphoria and are not uncommonly injected intravenously. They cause sleeplessness, anorexia and a feeling of having much energy. As such, they are sometimes abused by those who need to work or study for long periods of time. The withdrawal symptoms are generally mild with insomnia, decreased energy and sometimes depression.
Psychological dependence is common, and heavy use can cause a psychosis similar to schizophrenia.
A suspicion of amphetamine use can be confirmed by urine testing. Detoxification regimes are not needed, sudden withdrawal being safe, as long as the patient is monitored for depression and treated with antidepressants if necessary. Flashbacks may occur, where the user reexperiences the drug trip weeks or even months later. This can be very frightening to the patient and may cause much anxiety. The physical effects of LSD are quite mild, with elevated heart rate and dilated pupils.