This document discusses several neurological disorders and their drug treatments. It begins by describing the physiology of the basal ganglia and dopamine's role. It then discusses Parkinson's disease, noting that it involves degeneration of dopamine-producing neurons, resulting in reduced movement. Amyotrophic lateral sclerosis and multiple sclerosis are also summarized. The document focuses on drugs used to treat these conditions, including carbidopa-levodopa for Parkinson's, riluzole for ALS, and glatiramer for MS. Nursing considerations for each drug are provided.