This document summarizes Parkinson's disease and its treatment options. Parkinson's is caused by low dopamine and high acetylcholine levels in the brain, which leads to symptoms like tremors, rigidity, and slowed movement. The main treatments are drugs that increase dopamine like levodopa and dopamine agonists, or decrease acetylcholine like anticholinergics. Levodopa works by crossing the blood brain barrier and being converted to dopamine by dopamine decarboxylase. It is often given with carbidopa to prevent this conversion in other tissues and increase brain levodopa levels. Side effects of these drugs can include increased heart rate, stimulation of the central nervous system, and gastrointestinal issues.