Nursing care
Dopamine agonists and MAO-B inhibitors in Parkinson disease: safety and teaching
Written and reviewed by Dana Whitfield, RN, MSN · 4 min read · Updated October 2026
Short answer
Dopamine agonists such as pramipexole and ropinirole stimulate dopamine receptors directly, while MAO-B inhibitors such as rasagiline and selegiline slow dopamine breakdown. Agonists can cause sudden sleep episodes, impulse-control problems, hallucinations and orthostatic hypotension. MAO-B inhibitors interact dangerously with some opioids, cough medicines and antidepressants, and very high-tyramine foods can raise blood pressure.
Two ways to boost dopamine signalling
Parkinson disease reduces dopamine in the basal ganglia. Levodopa with carbidopa remains the mainstay, but dopamine agonists and MAO-B inhibitors are used early in disease or alongside levodopa. Agonists such as pramipexole and ropinirole act directly on dopamine receptors. MAO-B inhibitors such as rasagiline and selegiline block an enzyme that breaks dopamine down, prolonging its effect.
Because both increase dopaminergic activity, they share some effects with levodopa, including nausea, dyskinesia when combined, and hallucinations. Exam questions about these classes usually focus on the safety risks that are distinctive to them rather than on general Parkinson care, so concentrate on sleep, behaviour, blood pressure and interactions.
Dopamine agonists: sleep attacks and impulse control
Patients on pramipexole have reported falling asleep during daily activities, including driving, sometimes without warning. Ask about daytime drowsiness at every review and advise against driving or hazardous tasks until the effect is known and while sleepiness persists. Report any episode of unexpected sleep. Sedating medicines and alcohol add to the risk.
Pathological gambling, hypersexuality, compulsive eating and compulsive shopping have been reported with dopamine agonists. Patients may not link these to medicine or may feel embarrassed, so ask directly and invite family to report changes. Hallucinations are also more common, particularly in older adults. These effects are reasons for prescriber review, not for the patient to stop suddenly.
Practical safety planning helps. Encourage patients to rest when drowsy rather than pushing through, to avoid driving if they have ever fallen asleep unexpectedly, and to agree a plan with family for flagging changes in spending, gambling or eating. Families often notice impulse-control problems before the patient does, so including them in teaching is particularly valuable for this class.
Orthostatic hypotension and stopping safely
Dopamine agonists impair blood pressure regulation, causing orthostatic hypotension, especially during dose increases, and Parkinson disease itself blunts the normal response to standing. Check lying and standing blood pressure, teach slow position changes and assess fall risk. Report dizziness, fainting or falls, and review other medicines that lower blood pressure.
Stopping or rapidly reducing dopaminergic therapy can produce a syndrome resembling neuroleptic malignant syndrome, with high fever, rigidity and confusion. Teach patients not to stop on their own and to keep supplies during travel or hospital admission. In hospital, flag missed or delayed Parkinson doses, and avoid dopamine-blocking antiemetics or antipsychotics unless the prescriber confirms.
MAO-B inhibitors: drug and food interactions
Rasagiline is contraindicated with meperidine, tramadol, methadone, dextromethorphan, St John's wort, cyclobenzaprine and other MAO inhibitors because of serious reactions including serotonin syndrome. Serotonin syndrome can also occur with antidepressants. Check every new prescription and over-the-counter cough or cold medicine, and teach patients to show their medicine list to any pharmacist.
Rasagiline may cause hypertension, including severe episodes, at recommended doses. Strict tyramine restriction is not required at usual doses, but foods with very high tyramine content, such as some aged cheeses, may raise blood pressure and are best avoided. Teach patients to report sudden severe headache, chest pain or palpitations. Daytime sleepiness can also occur.
Worked exam-style scenario
Imagine a hypothetical patient taking rasagiline who is admitted with a cough and a painful injury. Orders include dextromethorphan syrup, meperidine for pain and paracetamol. Options are to give all three as written, give the opioid but hold the cough syrup, give paracetamol and clarify both the dextromethorphan and meperidine orders with the prescriber, or hold rasagiline indefinitely.
Clarifying both orders is the strongest answer because rasagiline is contraindicated with meperidine and dextromethorphan. Holding rasagiline independently is not the nurse's call. A different version describes a spouse reporting new heavy online gambling after starting pramipexole; the priority is reporting it as a possible impulse-control effect rather than labelling it a personal choice.
Sources and further reading
DailyMed: MIRAPEX (pramipexole) prescribing information. Falling asleep during daily activities, impulse-control behaviours, orthostatic hypotension, hallucinations and withdrawal-emergent hyperpyrexia.
DailyMed: AZILECT (rasagiline) prescribing information. Contraindicated drugs, hypertension, serotonin syndrome, somnolence and tyramine guidance.
MSD Manual Professional: Parkinson disease. Levodopa as mainstay and the roles of dopamine agonists and MAO-B inhibitors.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our neurological practice questions are the closest set to what this page covers.
Common questions
What is a sleep attack with pramipexole?
Falling asleep during everyday activities, sometimes without warning. Patients should avoid driving or hazardous tasks while sleepy and report any episode to the prescriber.
Does a patient on rasagiline need a strict tyramine diet?
Strict restriction is not required at recommended doses, but foods very high in tyramine, such as some aged cheeses, may raise blood pressure and are best avoided.
Which medicines are contraindicated with MAO-B inhibitors?
For rasagiline: meperidine, tramadol, methadone, dextromethorphan, St John's wort, cyclobenzaprine and other MAO inhibitors. Antidepressants also need prescriber review.