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AAN review finds specific forms of medical marijuana can help treat some symptoms of MS A review by the American Academy of Neurology of available scientific research on the usage of medical marijuana in human brain diseases finds certain types of medical marijuana might help deal with some symptoms of multiple sclerosis , but usually do not look like helpful in treating drug-induced movements in Parkinson's disease. Not enough evidence was found to show if medical marijuana is helpful in treating motor problems in Huntington's disease, tics in Tourette syndrome, cervical seizures and dystonia in epilepsy erectile dysfunction pills .