A client with Parkinson disease taking levodopa-carbidopa fo… | MyMerci
Medical EmergenciesPA
Question
A client with Parkinson disease taking levodopa-carbidopa for 5 years reports that the medication "doesn't last as long anymore" and that he has periods of severe stiffness 1-2 hours before his next dose. Which is the nurse's best interpretation?
1This is the wearing-off phenomenon, common with long-term levodopa therapy; the dosing interval may need to be shortened or a COMT inhibitor added.✓ Correct answer
2The medication has reached its maximum benefit; switch to non-pharmacologic therapy.
3This indicates the disease is cured and the medication can be stopped.
4The client should take a double dose immediately when stiffness returns.
Explanation
Correct (2): The wearing-off phenomenon is a predictable end-of-dose return of Parkinson symptoms 1-2 hours before the next scheduled dose. Caused by progressive disease and shorter duration of action over years. Management: shorter dosing interval, controlled-release levodopa, adding a COMT inhibitor (entacapone) or MAO-B inhibitor (rasagiline), or dopamine agonist add-on. (1) Not cured. (3) Double-dosing causes dyskinesia. (4) Pharmacologic adjustments still help.
In-depth explanation
Memory Tip Levodopa long-term complications = "Wearing-off" (predictable) vs "On-off" fluctuations (unpredictable) vs Dyskinesias (involuntary movements). CPG Avoid high-protein meals near doses — amino acids compete with levodopa absorption.
Clinical scenario
Scenario 68-year-old male with Parkinson disease on levodopa-carbidopa 25/100 mg PO QID × 5 years. Reports "wearing off" between doses with bradykinesia and stiffness in the last 1-2 hours.
Key concepts
Wearing-off phenomenon — Predictable end-of-dose return of Parkinson symptoms; treated by shortening interval or adding COMT/MAO-B inhibitor.
On-off fluctuations — Unpredictable sudden swings between mobility and immobility; later-stage levodopa complication.