Does Linezolid Interact with Fluoxetine?
Linezolid and Fluoxetine have a major drug interaction according to established clinical references. Combining linezolid with fluoxetine can precipitate serotonin syndrome (agitation, hyperthermia, rigidity, autonomic instability). Fluoxetine's long half-life means the risk persists for weeks after it is stopped; a washout period is generally required before linezolid is given. The mechanism involves linezolid is a reversible non-selective monoamine oxidase inhibitor; combined with the serotonin reuptake inhibition of fluoxetine, it produces excess central serotonergic activity. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This information is drawn from established clinical references and is provided alongside our FDA-labeling–based data.
- Severity
- Major
- Linezolid Class
- Oxazolidinone Antibacterial
- Management
- Close medical supervision required
- Data Source
- Curated clinical reference
How This Interaction Works
The interaction between Linezolid and Fluoxetine occurs because linezolid is a reversible non-selective monoamine oxidase inhibitor; combined with the serotonin reuptake inhibition of fluoxetine, it produces excess central serotonergic activity. Clinically, this means combining linezolid with fluoxetine can precipitate serotonin syndrome (agitation, hyperthermia, rigidity, autonomic instability). fluoxetine's long half-life means the risk persists for weeks after it is stopped; a washout period is generally required before linezolid is given. This is classified as a major interaction, meaning it could cause serious harm if not properly managed. Your healthcare provider may need to adjust dosages, substitute one medication, or increase monitoring frequency.
What To Tell Your Doctor or Pharmacist
If you are taking Linezolid and your doctor is considering prescribing Fluoxetine (or vice versa), make sure to:
- Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
- Ask whether the benefits of combining these medications outweigh the risks for your specific situation
- Ask what symptoms to watch for that would indicate the interaction is causing problems
- Ask how frequently you should be monitored while these are co-prescribed
- Ask whether any dosage adjustments are needed
- Never stop or change either medication without first consulting your healthcare provider