Cannabis is a genus of flowering plant in the family Cannabaceae. The number of species within the genus is disputed. Three species may be recognized: Cannabis sativa, Cannabis indica, and Cannabis ruderalis Medical cannabis (or medical marijuana) refers to the use of cannabis and its constituent cannabinoids, to treat disease or improve symptoms. Cannabis is used to reduce nausea and vomiting during chemotherapy, to improve appetite in people with HIV/AIDS, and to treat chronic pain and muscle spasms.
Cannabidiol (CBD) is a metabolite of Cannabis sativa. It has relaxing, anticonvulsant, antidistonic, antioxidant, anti-inflammatory effects, promotes sleep and is relaxing against anxiety and panic. It has also been shown to reduce intraocular pressure and is a promising atypical antipsychotic.