Drug interactions
Ofloxacin + Saquinavir
Severity: Major
Ofloxacin and Saquinavir: 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
Saquinavir, boosted with ritonavir, causes dose-dependent QT and PR prolongation and its labeling warns about combination with other QT-prolonging drugs. Ofloxacin adds to the repolarization effect, raising the risk of torsades de pointes.
What this interaction means in plain words
Ofloxacin and Saquinavir 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.
Why it happens
Additive pharmacodynamic QT prolongation; ofloxacin is not meaningfully affected by CYP inhibition.
What to do
Use a non-QT-prolonging antibiotic where possible. If co-administered, obtain a baseline and follow-up ECG and correct electrolyte abnormalities.
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
Frequently asked questions
Can I take Ofloxacin with Saquinavir?
MediHelp rates the interaction as major. Ofloxacin and Saquinavir 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. Saquinavir, boosted with ritonavir, causes dose-dependent QT and PR prolongation and its labeling warns about combination with other QT-prolonging drugs. Ofloxacin adds to the repolarization effect, raising the risk of torsades de pointes.
How serious is the interaction between Ofloxacin and Saquinavir?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use a non-QT-prolonging antibiotic where possible. If co-administered, obtain a baseline and follow-up ECG and correct electrolyte abnormalities.
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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