A patient with Parkinson disease is taking levodopa/carbidopa (Sinemet) and reports occasional periods of loss of drug effect lasting from minutes to several hours. The nurse questions the patient further and discovers that these episodes occur at different times related to the medication administration. The nurse will contact the provider to discuss:

A. Giving a direct-acting dopamine agonist (e.g., pramipexole or ropinirole) can be part of Parkinson’s management, but the patient is already on levodopa/carbidopa. The immediate concern is the “on-off” phenomenon, which is better addressed by adjusting the current levodopa regimen before adding another drug class. B. Shortening the dosing interval of levodopa/carbidopa is an appropriate strategy to manage motor fluctuations or “on-off” periods. These periods occur when the medication’s effect wears off before the next scheduled dose. By reducing the time between doses, the patient maintains more consistent dopaminergic activity, reducing periods of immobility or symptom recurrence. C. Administering a COMT inhibitor such as entacapone can extend the effect of levodopa and help with motor fluctuations, but it is usually considered after optimizing levodopa dosing. The first step is to adjust the dosing schedule. D. Adding amantadine, a dopamine-releasing agent, can help with dyskinesias but does not directly address the timing of “on-off” episodes related to levodopa wearing off.