Drug interactions
Gemifloxacin + Saquinavir
Severity: Major
Gemifloxacin 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) prolongs the QT and PR intervals and gemifloxacin also prolongs QT. Combined use increases the risk of torsades de pointes and other serious arrhythmias.
What this interaction means in plain words
Gemifloxacin 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; gemifloxacin is not significantly CYP-metabolized so a pharmacokinetic effect is not the main concern.
What to do
Avoid the combination and use an alternative antibiotic. If unavoidable, obtain a baseline ECG, monitor QTc 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 Gemifloxacin
- Arsenic trioxide + Gemifloxacin Contraindicated
- Dofetilide + Gemifloxacin Contraindicated
- Gemifloxacin + Ibutilide Contraindicated
- Gemifloxacin + Pimozide Contraindicated
- Gemifloxacin + Thioridazine Contraindicated
- Gemifloxacin + Vandetanib Contraindicated
Frequently asked questions
Can I take Gemifloxacin with Saquinavir?
MediHelp rates the interaction as major. Gemifloxacin 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) prolongs the QT and PR intervals and gemifloxacin also prolongs QT. Combined use increases the risk of torsades de pointes and other serious arrhythmias.
How serious is the interaction between Gemifloxacin 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: Avoid the combination and use an alternative antibiotic. If unavoidable, obtain a baseline ECG, monitor QTc and correct electrolyte abnormalities.
What other medicines interact with Gemifloxacin?
MediHelp also lists interactions of Gemifloxacin with, for example, Arsenic trioxide, Dofetilide, Ibutilide. The full list is on the Gemifloxacin page.
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