MAJOR — Use With Caution
Both drugs prolong QT. Avoid combination if possible. If used together, ECG monitoring is essential.
Evidence level: STRONG
Amiodarone already lengthens the QT interval in your heart (that is partly how it works). Adding ondansetron (Zofran) further increases this effect, raising the risk of dangerous heart rhythms.
Additive QT prolongation: amiodarone is a Class III antiarrhythmic that prolongs QT. Ondansetron independently prolongs QT. FDA labels warn about combining QT-prolonging drugs.
Avoid taking ondansetron if you are on amiodarone. Tell your doctor about your heart medication before receiving any anti-nausea drugs.
Take Ondansetron and Amiodarone as prescribed by your healthcare provider. If both are taken daily, maintain consistent timing for each. Many medications compete for the same liver enzymes (CYP450 system). Your pharmacist can advise whether spacing these apart would improve efficacy.
Higher risk for: elderly, those with liver or kidney impairment, polypharmacy (5+ medications), recent medication changes, or those with multiple chronic conditions. Consult your pharmacist for specific risk factors.
Palpitations, dizziness, fainting, irregular heartbeat, sudden collapse
Use alternative anti-emetics. If ondansetron is unavoidable, request continuous ECG monitoring and electrolyte checks.
Discuss safer alternatives with your healthcare provider. They can recommend substitutions based on your specific health goals while minimizing interaction risks. Always bring a complete list of everything you take to your appointments.
Amiodarone already lengthens the QT interval in your heart (that is partly how it works). Adding ondansetron (Zofran) further increases this effect, raising the risk of dangerous heart rhythms.
Take Ondansetron and Amiodarone as prescribed by your healthcare provider. If both are taken daily, maintain consistent timing for each. Many medications compete for the same liver enzymes (CYP450 system). Your pharmacist can advise whether spacing these apart would improve efficacy.
Palpitations, dizziness, fainting, irregular heartbeat, sudden collapse
Discuss safer alternatives with your healthcare provider. They can recommend substitutions based on your specific health goals while minimizing interaction risks. Always bring a complete list of everything you take to your appointments.
Use alternative anti-emetics. If ondansetron is unavoidable, request continuous ECG monitoring and electrolyte checks.
Or browse the full interaction database (121,000+ pairs).