No evidence of subgroups found in amphetamine consumers in Iran.

Amphetamine type substances are the second most commonly consumed illicit drug type and their use is an important contributor to the global burden of disease. This investigation set out to determine whether, similar to alcohol or nicotine addiction, subgroups of consumers can also be found in amphetamine addicts. 204 consumers of methamphetamine only (n = 50) or both methamphetamine and heroin (n = 154) have been investigated in Mashhad, Iran by means of "Lesch Alcoholism Typology". No significant differences in consumption pattern or age of onset have been found between the different types. Many subjects, however, reported symptoms of anxiety (n=78) or depression (n = 129) prior to drug use. These findings highlight the need for high quality epidemiological studies further addressing this issue.