When teaching a client with Parkinson's disease, which rationale for the prescription of carbidopa-levodopa should the nurse include?

When teaching a client with Parkinson's disease, which rationale for the prescription of carbidopa-levodopa should the nurse include?

• A. Increases the amount of dopamine available for muscles to function correctly.
• B. Slows the scarring in the myelin sheath improving muscle tone and strength.
• C. Reduces the inflammatory process improving nerve transmission and function.
• D. Acts as an antiseizure medication reducing the tremors caused by the disease.

Answer: (A)

The reason this medication is prescribed is to increase dopamine availability in the brain to improve motor function. Levodopa acts as a precursor that crosses the blood–brain barrier and is converted to dopamine in the brain, helping replace the dopamine that is deficient in Parkinson’s disease. Carbidopa blocks peripheral conversion of levodopa to dopamine, so more levodopa reaches the brain and fewer side effects (like nausea) occur from peripheral dopamine. Together, this combination enhances dopamine in the brain, which improves movement and reduces symptoms such as tremor, rigidity, and bradykinesia. The other options describe processes (myelin changes, inflammation, or seizure control) that aren’t how carbidopa-levodopa works.

The reason this medication is prescribed is to increase dopamine availability in the brain to improve motor function. Levodopa acts as a precursor that crosses the blood–brain barrier and is converted to dopamine in the brain, helping replace the dopamine that is deficient in Parkinson’s disease. Carbidopa blocks peripheral conversion of levodopa to dopamine, so more levodopa reaches the brain and fewer side effects (like nausea) occur from peripheral dopamine. Together, this combination enhances dopamine in the brain, which improves movement and reduces symptoms such as tremor, rigidity, and bradykinesia. The other options describe processes (myelin changes, inflammation, or seizure control) that aren’t how carbidopa-levodopa works.