SAFE — No Known Interaction
🟢 SAFE — Fluoxetine and Methadone can be taken together safely.
Evidence level: STRONG
Fluoxetine and Methadone are generally considered safe to use together based on current medical evidence. No adverse interactions have been reported.
No clinically significant interaction between Fluoxetine and Methadone has been identified in medical literature or FDA drug labeling.
Fluoxetine and Methadone do not have a documented clinically significant interaction. Continue both as prescribed. As a general rule, inform every prescriber about all medications you take, including those from other doctors.
Some opioids (tramadol, fentanyl, meperidine) have serotonergic activity and can cause serotonin syndrome with SSRIs. Take each at their prescribed times. Watch for agitation, rapid heartbeat, muscle rigidity, or confusion. Codeine and morphine are generally lower risk.
Higher risk for: elderly, those on multiple serotonergic drugs, people with liver impairment, CYP2D6 poor metabolizers, recent dose changes, or concurrent use of MAOIs or triptans.
Dual risk — serotonin syndrome and CNS depression. Watch for: confusion, agitation, muscle rigidity, rapid heartbeat, and fever (serotonin syndrome signs) as well as excessive sedation, slowed breathing, and impaired coordination (CNS depression signs) when taking Fluoxetine with Methadone. When to seek emergency help: Difficulty breathing, unresponsiveness, seizures, very high fever, or irregular heartbeat. Do not increase either dose without medical guidance. Carry naloxone if prescribed opioids alongside serotonergic medications.
No urgent need to discuss, but always keep your doctor informed of your full supplement and medication list. Say: "I take Fluoxetine and Methadone — is that OK?"
These medications are safe to take together at standard doses. Continue taking as prescribed and keep your pharmacist informed of your complete medication list.
Fluoxetine and Methadone are generally considered safe to use together based on current medical evidence. No adverse interactions have been reported.
Some opioids (tramadol, fentanyl, meperidine) have serotonergic activity and can cause serotonin syndrome with SSRIs. Take each at their prescribed times. Watch for agitation, rapid heartbeat, muscle rigidity, or confusion. Codeine and morphine are generally lower risk.
Dual risk — serotonin syndrome and CNS depression. Watch for: confusion, agitation, muscle rigidity, rapid heartbeat, and fever (serotonin syndrome signs) as well as excessive sedation, slowed breathing, and impaired coordination (CNS depression signs) when taking Fluoxetine with Methadone. When to seek emergency help: Difficulty breathing, unresponsiveness, seizures, very high fever, or irregular heartbeat. Do not increase either dose without medical guidance. Carry naloxone if prescribed opioids alongside serotonergic medications.
These medications are safe to take together at standard doses. Continue taking as prescribed and keep your pharmacist informed of your complete medication list.
No urgent need to discuss, but always keep your doctor informed of your full supplement and medication list. Say: "I take Fluoxetine and Methadone — is that OK?"
Or browse the full interaction database (121,000+ pairs).