Drug interactions
Chloroquine + Saquinavir
Severity: Major
Chloroquine 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
Both drugs prolong the QT and PR intervals, and combined use raises the risk of torsades de pointes and serious arrhythmia. Ritonavir-boosted saquinavir labeling cautions against use with other QT-prolonging drugs.
What this interaction means in plain words
Chloroquine 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 prolongation of cardiac repolarization, with possible CYP3A4-related exposure changes.
What to do
Avoid the combination if possible; if unavoidable, check baseline ECG and electrolytes and monitor the QTc.
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 Chloroquine
- Chloroquine + Cisapride Contraindicated
- Chloroquine + Dofetilide Contraindicated
- Chloroquine + Dronedarone Contraindicated
- Chloroquine + Droperidol Contraindicated
- Chloroquine + Panobinostat Contraindicated
- Chloroquine + Pimozide Contraindicated
Frequently asked questions
Can I take Chloroquine with Saquinavir?
MediHelp rates the interaction as major. Chloroquine 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. Both drugs prolong the QT and PR intervals, and combined use raises the risk of torsades de pointes and serious arrhythmia. Ritonavir-boosted saquinavir labeling cautions against use with other QT-prolonging drugs.
How serious is the interaction between Chloroquine 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 if possible; if unavoidable, check baseline ECG and electrolytes and monitor the QTc.
What other medicines interact with Chloroquine?
MediHelp also lists interactions of Chloroquine with, for example, Cisapride, Dofetilide, Dronedarone. The full list is on the Chloroquine page.
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