Drug interactions
Granisetron + Levofloxacin
Severity: Moderate
Granisetron and Levofloxacin: 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
Levofloxacin can prolong the QT interval, and granisetron may add to it. The combination may increase the risk of torsades de pointes in patients with predisposing conditions.
What this interaction means in plain words
Granisetron and Levofloxacin 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.
Granisetron belongs to Gastrointestinal Tract; Levofloxacin belongs to Anti Bacterial.
Why it happens
Additive QT prolongation through cardiac potassium channel inhibition.
What to do
Correct hypokalemia and hypomagnesemia and check the ECG in patients with additional risk factors. Consider a non-fluoroquinolone antibiotic if the 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 Granisetron
- Apomorphine + Granisetron Contraindicated
- Amiodarone + Granisetron Major
- Amisulpride + Granisetron Major
- Arsenic trioxide + Granisetron Major
- Artemether / lumefantrine + Granisetron Major
- Artemether + Granisetron Major
Other interactions of Levofloxacin
- Dronedarone + Levofloxacin Contraindicated
- Ibutilide + Levofloxacin Contraindicated
- Levofloxacin + Thioridazine Contraindicated
- Levofloxacin + Vandetanib Contraindicated
- Levofloxacin + Ziprasidone Contraindicated
- Adagrasib + Levofloxacin Major
Frequently asked questions
Can I take Granisetron with Levofloxacin?
MediHelp rates the interaction as moderate. Granisetron and Levofloxacin 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. Levofloxacin can prolong the QT interval, and granisetron may add to it. The combination may increase the risk of torsades de pointes in patients with predisposing conditions.
How serious is the interaction between Granisetron and Levofloxacin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Correct hypokalemia and hypomagnesemia and check the ECG in patients with additional risk factors. Consider a non-fluoroquinolone antibiotic if the QTc is prolonged.
What other medicines interact with Granisetron?
MediHelp also lists interactions of Granisetron with, for example, Apomorphine, Amiodarone, Amisulpride. The full list is on the Granisetron page.
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