The nurse is assessing a client who was recently diagnosed with Parkinson's disease and is taking carbidopa-levodopa. The client is concerned that the medication is not working. Which intervention should the nurse implement first?

A. Explore what the client means by the drug "is not working": The first step in addressing the client's concern is to understand their perception of how the medication is performing. This involves exploring their specific symptoms, any changes they've noticed, and their expectations of the medication. This understanding will help guide further assessment and intervention. B. Determine if the client is taking the medication before meals: Carbidopa-levodopa is typically recommended to be taken on an empty stomach to optimize absorption. While this is important for effective medication use, addressing the client's perception of the drug's effectiveness takes priority to identify whether there is an issue with their treatment regimen or if other factors are influencing their response. C. Evaluate the client for signs of dyskinesia: Dyskinesia, or involuntary movements, can be a side effect of long-term use of carbidopa-levodopa, but evaluating for these signs should follow the initial exploration of the client's concerns. If the client believes the medication is ineffective, it’s crucial first to clarify what symptoms they are experiencing before assessing for specific side effects. D. Ask if the client's morning voids are dark colored: Dark-colored urine is not directly related to the effectiveness of carbidopa-levodopa. This assessment is less relevant compared to understanding the client's overall experience with the medication and symptoms. Addressing the client’s concern about the medication’s effectiveness should be the priority.