Morphine and Linezolid Interaction
Drug interaction information between Morphine and Linezolid.
Morphine and Linezolid have a documented minor interaction in FDA labeling.
FDA drug labeling documents a minor-severity interaction between Morphine and Linezolid. Major interactions are generally avoided, moderate ones may need monitoring or a dose adjustment, and minor ones are usually low-risk. This page shows the documented mechanism and guidance. Label-documented interactions are not a complete safety review, so always confirm your own medications with a pharmacist or doctor. Educational information, not medical advice.
How They Interact
Linezolid acts as a monoamine oxidase inhibitor, which stops the body from breaking down serotonin. This can cause serotonin to reach dangerous levels when taken with morphine.
What To Do
Use this combination with extreme caution and seek medical help if you experience agitation, hallucinations, or a high fever.
FDA Label Information
Examples: Selective serotonin reuptake inhibitors (SSRIs), serotonin and norepinephrine reuptake inhibitors (SNRIs), tricyclic antidepressants (TCAs), triptans, 5-HT3 receptor antagonists, drugs that effect the serotonin neurotransmitter system (e.g., mirtazapine, trazodone, tramadol), certain muscle relaxants (i.e., cyclobenzaprine, metaxalone), monoamine oxidase (MAO) inhibitors (those intended to treat psychiatric disorders and also others, such as linezolid and intravenous methylene blue). Examples: Phenelzine, tranylcypromine, linezolid.
Morphine Also Interacts With
- Trazodone minor
- Tramadol minor
- Cyclobenzaprine minor
- Mirtazapine minor
- Verapamil minor
Linezolid Also Interacts With
- Citalopram major
- Escitalopram major
- Mirtazapine major
- Paroxetine major
- Safinamide major
Frequently Asked Questions
Can I take Morphine and Linezolid together?
This is a minor interaction. Use this combination with extreme caution and seek medical help if you experience agitation, hallucinations, or a high fever.
How serious is the interaction between Morphine and Linezolid?
This interaction is classified as "minor" severity by the FDA. Minor interactions are unlikely to cause significant problems but should still be mentioned to your healthcare provider.
Why do Morphine and Linezolid interact?
Linezolid acts as a monoamine oxidase inhibitor, which stops the body from breaking down serotonin. This can cause serotonin to reach dangerous levels when taken with morphine.
Understanding the Morphine and Linezolid Interaction
FDA-approved prescribing information for these two drugs flags their combination as a minor-severity interaction. Morphine belongs to the Opioid Analgesic class and Linezolid belongs to the Oxazolidinone Antibiotic class - two categories that can collide when co-prescribed. The mechanism described in FDA labeling is: Linezolid acts as a monoamine oxidase inhibitor, which stops the body from breaking down serotonin. Severity tiers matter: major flags generally advise avoidance, moderate flags often require monitoring or dose adjustment, and minor flags may only call for awareness.
Context around a specific patient determines real-world impact. Morphine has 30 total documented interactions on file in this dataset, and Linezolid has 29. Each additional medication compounds the interaction surface, which is why pharmacists run full-profile checks rather than evaluating one pair at a time. FDA-derived guidance for this pair is: Use this combination with extreme caution and seek medical help if you experience agitation, hallucinations, or a high fever. Timing of doses, renal and hepatic function, age, and other concurrent prescriptions all shape whether a labeled interaction matters clinically.
An interaction flag is not a verdict. A large share of labeled interactions are managed routinely in clinical practice, the fix may be as simple as spacing doses or adding a monitoring test. Others require the prescriber to choose a different medication entirely. This page surfaces FDA-sourced labeling and openFDA data for educational purposes only; it is not medical advice and cannot account for your full clinical picture. Never start, stop, or adjust either Morphine or Linezolid based on a web page, speak with your prescriber or pharmacist before making any change.
Sources: FDA Drug Labels (SPL) via openFDA (2026). This is for informational purposes only and is not medical advice. Always consult your healthcare provider about drug interactions.
Read our methodology - how this data is sourced, computed, and verified.