Drug interactions
Ofloxacin + Ondansetron
Severity: Moderate
Ofloxacin and Ondansetron: moderate interaction.
Last updated
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
Both drugs can prolong the QT interval, though ofloxacin has a relatively smaller effect than some other fluoroquinolones. Combined use may still increase risk in patients with electrolyte disturbances or heart disease.
What this interaction means in plain words
Ofloxacin and Ondansetron can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Ofloxacin belongs to Anti Bacterial; Ondansetron belongs to Gastrointestinal Tract.
Why it happens
Additive delayed ventricular repolarization through potassium channel blockade.
What to do
Check potassium and magnesium and consider a baseline ECG in at-risk patients. Use another antibiotic or antiemetic if QTc is prolonged.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Ondansetron
- Apomorphine + Ondansetron Contraindicated
- Ondansetron + Thioridazine Contraindicated
- Ondansetron + Vandetanib Contraindicated
- Adagrasib + Ondansetron Major
- Amiodarone + Ondansetron Major
- Amisulpride + Ondansetron Major
Other interactions of Ofloxacin
- Ofloxacin + Thioridazine Contraindicated
- Adagrasib + Ofloxacin Major
- Amiodarone + Ofloxacin Major
- Amisulpride + Ofloxacin Major
- Anagrelide + Ofloxacin Major
- Arsenic trioxide + Ofloxacin Major
Frequently asked questions
Can I take Ofloxacin with Ondansetron?
MediHelp rates the interaction as moderate. Ofloxacin and Ondansetron can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Both drugs can prolong the QT interval, though ofloxacin has a relatively smaller effect than some other fluoroquinolones. Combined use may still increase risk in patients with electrolyte disturbances or heart disease.
How serious is the interaction between Ofloxacin and Ondansetron?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check potassium and magnesium and consider a baseline ECG in at-risk patients. Use another antibiotic or antiemetic if QTc is prolonged.
What other medicines interact with Ondansetron?
MediHelp also lists interactions of Ondansetron with, for example, Apomorphine, Thioridazine, Vandetanib. The full list is on the Ondansetron page.
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