BACKGROUND: Review commissioned in 1996 by the Department of Health (DOH). AIMS: Assess therapeutic profile of cannabis and cannabinoids. METHOD: Medline search, references supplied by DOH and others, and personal communications. RESULTS AND CONCLUSIONS: Cannabis and some cannabinoids are effective anti-emetics and analgesics and reduce intra-ocular pressure. There is evidence of symptom relief and improved well-being in selected neurological conditions, AIDS and certain cancers. Cannabinoids may reduce anxiety and improve sleep. Anticonvulsant activity requires clarification. Other properties identified by basic research await evaluation. Standard treatments for many relevant disorders are unsatisfactory. Cannabis is safe in overdose but often produces unwanted effects, typically sedation, intoxication,...