Drug interactions
Ofloxacin + Vandetanib
Severity: Major
Ofloxacin and Vandetanib: major 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
Vandetanib markedly prolongs the QT interval and has a boxed warning for torsades de pointes and sudden death. Ofloxacin adds further QT risk, so the combination should be avoided.
What this interaction means in plain words
Ofloxacin and Vandetanib can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Ofloxacin belongs to Anti Bacterial; Vandetanib belongs to Oncology.
Why it happens
Additive pharmacodynamic QT prolongation.
What to do
Avoid the combination and use a non-QT-prolonging antibiotic. If unavoidable, perform frequent ECG monitoring and maintain normal potassium, magnesium and calcium.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Ofloxacin
- Ofloxacin + Thioridazine Contraindicated
- Adagrasib + Ofloxacin Major
- Amiodarone + Ofloxacin Major
- Amisulpride + Ofloxacin Major
- Anagrelide + Ofloxacin Major
- Arsenic trioxide + Ofloxacin Major
Other interactions of Vandetanib
- Amiodarone + Vandetanib Contraindicated
- Amisulpride + Vandetanib Contraindicated
- Amitriptyline + Vandetanib Contraindicated
- Anagrelide + Vandetanib Contraindicated
- Asenapine + Vandetanib Contraindicated
- Chloroquine + Vandetanib Contraindicated
Frequently asked questions
Can I take Ofloxacin with Vandetanib?
MediHelp rates the interaction as major. Ofloxacin and Vandetanib can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Vandetanib markedly prolongs the QT interval and has a boxed warning for torsades de pointes and sudden death. Ofloxacin adds further QT risk, so the combination should be avoided.
How serious is the interaction between Ofloxacin and Vandetanib?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination and use a non-QT-prolonging antibiotic. If unavoidable, perform frequent ECG monitoring and maintain normal potassium, magnesium and calcium.
What other medicines interact with Ofloxacin?
MediHelp also lists interactions of Ofloxacin with, for example, Thioridazine, Adagrasib, Amiodarone. The full list is on the Ofloxacin page.
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