Do cannabinoids reduce multiple sclerosis-related spasticity?

The plant Cannabis sativa contains numerous cannabinoids, which are aromatic hydrocarbons that have central nervous system effects mediated through specific cannabinoid receptors. Some patients with multiple sclerosis (MS) report symptomatic relief from spasticity, pain, and other symptoms when using smoked cannabis, and small trials have suggested some symptomatic benefit. Further research is warranted with regards to both outcome instrument development and the effects of cannabinoids on MS-related spasticity.