A nurse is providing education to a student nurse on how carbidopa levodopa controls symptoms of Parkinson's Disease. The nurse will identify which of the following as the pharmacologic effects
Explanation & Rationale
A. Increases the availability of acetylcholine in the brain: Carbidopa-levodopa does not increase acetylcholine. Parkinson’s disease is characterized by a relative excess of acetylcholine compared with dopamine, and treatment aims to restore dopamine, not acetylcholine levels. B. Increases the availability of serotonin in the brain: Carbidopa-levodopa does not affect serotonin levels. Its mechanism is specific to dopamine replacement to improve motor function in Parkinson’s disease. C. Increases the availability of dopamine in the brain: Levodopa is converted to dopamine in the brain, replenishing the deficient neurotransmitter in Parkinson’s disease. Carbidopa inhibits peripheral conversion of levodopa, increasing dopamine availability centrally and reducing side effects like nausea. D. Increases the availability of norepinephrine in the brain: Carbidopa-levodopa does not directly increase norepinephrine. Its therapeutic effect is primarily through enhancing central dopamine concentrations to improve motor symptoms.