Carbidopa is a medication primarily used to treat symptoms of Parkinson's disease. It works by preventing the conversion of levodopa into dopamine before it reaches the brain, allowing more levodopa to enter the central nervous system. This helps improve motor function and reduce symptoms like tremors and stiffness. Carbidopa is often combined with levodopa in a single medication, enhancing the effectiveness of treatment while minimizing side effects such as nausea. It is important for patients to follow their healthcare provider's instructions when using carbidopa to achieve the best results in managing their condition.