Drug interactions
Morphine + Safinamide
Severity: Major
Morphine and Safinamide: major interaction.
Last updated Sources: US FDA label
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Safinamide is a MAO-B inhibitor, and its labeling warns against use with opioids because of reports of serotonin syndrome. Morphine has weaker serotonergic activity than some opioids, but the labeling treats the class cautiously. Severe reactions could include agitation, hyperthermia and autonomic instability.
What this interaction means in plain words
Morphine and Safinamide can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Morphine belongs to Musculoskeletal; Safinamide belongs to Central Nervous System.
Why it happens
Possible additive serotonergic effects from MAO inhibition combined with opioid activity; the mechanism for morphine is not well established.
What to do
Avoid if possible and choose an alternative analgesic. If used, monitor closely for signs of serotonin toxicity and CNS changes.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Morphine and Safinamide, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
References
Other interactions of Morphine
- Alvimopan + Morphine Contraindicated
- Isocarboxazid + Morphine Contraindicated
- Morphine + Olanzapine / samidorphan Contraindicated
- Morphine + Phenelzine Contraindicated
- Morphine + Tranylcypromine Contraindicated
- Alfentanil + Morphine Major
Other interactions of Safinamide
- Amitriptyline + Safinamide Contraindicated
- Amoxapine + Safinamide Contraindicated
- Amphetamine polistirex + Safinamide Contraindicated
- Clomipramine + Safinamide Contraindicated
- Cyclobenzaprine + Safinamide Contraindicated
- Desipramine + Safinamide Contraindicated
Frequently asked questions
Can I take Morphine with Safinamide?
MediHelp rates the interaction as major. Morphine and Safinamide can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Safinamide is a MAO-B inhibitor, and its labeling warns against use with opioids because of reports of serotonin syndrome. Morphine has weaker serotonergic activity than some opioids, but the labeling treats the class cautiously. Severe reactions could include agitation, hyperthermia and autonomic instability.
How serious is the interaction between Morphine and Safinamide?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid if possible and choose an alternative analgesic. If used, monitor closely for signs of serotonin toxicity and CNS changes.
What other medicines interact with Morphine?
MediHelp also lists interactions of Morphine with, for example, Alvimopan, Isocarboxazid, Olanzapine / samidorphan. The full list is on the Morphine page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
