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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medically reviewed by WellAlly Editorial TeamLast reviewed October 19, 2026Editorial policy
Medication15 min read

Patient Guide to Selegiline (MAO-B Inhibitor) for Parkinson's Disease

Published: October 19, 2026Updated: October 19, 2026

Selegiline is a monoamine oxidase type B (MAO-B) inhibitor prescribed to manage motor symptoms in Parkinson's disease, either alone or with levodopa. It works by slowing the breakdown of dopamine in the brain to improve movement control. Proper timing, awareness of drug interactions, and monitoring for side effects are essential for safe and effective therapy.

Quick Summary

Take selegiline with morning and midday meals to avoid insomnia, and check with your doctor before starting any new medications or supplements to avoid dangerous drug interactions.

Important Medical Disclaimer

This guide is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult with qualified healthcare providers for medical concerns.

Step-by-Step Guide

1

Time Your Doses to Prevent Insomnia

Take standard oral selegiline twice daily, typically with breakfast and lunch. The body metabolizes selegiline into trace amounts of amphetamine-like compounds, which can cause central nervous system stimulation. Avoid taking your second dose in the late afternoon or evening to minimize the risk of sleep disturbances and vivid dreams.

Important: Do not take selegiline late in the day or at bedtime unless explicitly instructed by your neurologist.

2

Follow Proper Administration Guidelines

Swallow standard tablets whole with water alongside a meal to reduce stomach upset. If you are prescribed the orally disintegrating tablet (ODT), place it on your tongue with dry hands and allow it to dissolve completely without swallowing saliva immediately. Do not eat, drink, or rinse your mouth for at least 5 minutes after taking the disintegrating tablet to ensure complete absorption.

3

Screen for Severe Drug Interactions

Selegiline interacts dangerously with several prescription and over-the-counter medications. Combining it with certain antidepressants (such as SSRIs, SNRIs, or tricyclics), pain medications like tramadol or meperidine, or cough suppressants containing dextromethorphan can trigger life-threatening serotonin syndrome. Always maintain an updated list of all your medications and supplements for your healthcare team.

Important: Never start new antidepressants, opioid pain relievers, or OTC cold remedies containing dextromethorphan without pharmacist or physician clearance.

4

Be Mindful of Tyramine Intake at Higher Doses

At typical doses of 10 mg per day or less, selegiline selectively inhibits MAO-B, meaning strict dietary tyramine restrictions are generally not necessary. However, if prescribed higher doses or the transdermal patch formulation at elevated strengths, selectivity is lost, creating a risk for hypertensive crisis. Avoid consuming large amounts of aged cheeses, cured meats, draft beer, or fermented soy products if advised by your physician.

Important: Seek emergency medical care immediately if you experience a severe throbbing headache, chest pain, palpitations, or sudden neck stiffness.

5

Monitor for Increased Levodopa Side Effects

When added to carbidopa/levodopa, selegiline amplifies the effect of dopamine in the brain. While this prolongs the 'on' time between doses, it can also exacerbate levodopa-related side effects such as involuntary jerky movements (dyskinesia), visual hallucinations, or lightheadedness upon standing (orthostatic hypotension). Your doctor may need to decrease your levodopa dosage by 10% to 30% after initiating selegiline.

Important: Report any new hallucinations, sudden dizziness when standing, or worsening involuntary movements to your doctor promptly.

6

Maintain Consistent Storage and Adherence

Store your medication at room temperature away from excessive moisture, heat, and direct light, keeping it out of reach of children and pets. Take your doses at the same times each day to maintain steady dopamine regulation. Do not stop taking selegiline abruptly, as sudden discontinuation can lead to severe symptom rebound or a dangerous condition resembling neuroleptic malignant syndrome.

Frequently Asked Questions

Why does selegiline cause difficulty sleeping?
Selegiline is broken down by the liver into active metabolites, including l-amphetamine and l-methamphetamine. These compounds stimulate the central nervous system, which can cause insomnia and alertness if doses are taken late in the day.
Can I take over-the-counter cold and flu medicine with selegiline?
No. Many over-the-counter cold medications contain dextromethorphan (which can trigger serotonin syndrome) or decongestants like pseudoephedrine and phenylephrine (which can cause severe spikes in blood pressure). Always check with your pharmacist before taking OTC products.
What should I do if I miss a scheduled dose?
Take the missed dose as soon as you remember, provided it is still early in the day. If it is already late afternoon or evening, skip the missed dose and resume your regular schedule the next morning. Never double up on doses.
Do I need to follow a strict low-tyramine diet while on selegiline?
At standard oral doses of 10 mg daily or lower, selegiline is selective for MAO-B and typically does not require strict dietary tyramine limits. However, you should still avoid excessive quantities of heavily aged or fermented foods, and always follow any specific dietary guidance given by your doctor.
  1. 1
    National Library of Medicine - MedlinePlusSource
  2. 2
    Mayo ClinicSource
  3. 3
    NHS UKSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed October 19, 2026. · Read our editorial policy