The second step in the treatment process is medication. The medications focus on the chemicals released by neurotransmitters in the nervous system, which control muscle movement. The medications on the market today are anticholinergics, benzodiazepines, baclofen, dopaminergic agents/dopamine-depleting agents, and tetrabenazine.[5] Each medication is started on a low dosage and gradually increased to higher doses as the disease progresses and the side effects are known for the individual.