Can I Take These?

Can You Take Ciprofloxacin and Warfarin Together?

Ciprofloxacin can enhance warfarin's blood-thinning effect -- named directly on ciprofloxacin's FDA label.

Use cautionEvidence: High

What the interaction means

Ciprofloxacin's FDA prescribing information states in its Drug Interactions section: "Quinolones, including ciprofloxacin, have been reported to enhance the effects of the oral anticoagulant warfarin or its derivatives. When these products are administered concomitantly, prothrombin time or other suitable coagulation tests should be closely monitored."

Why it may happen

Not further specified mechanistically by the label beyond describing the enhanced anticoagulant effect.

Practical context

Because warfarin already carries a boxed warning for bleeding risk and requires individualized INR-based dose management, the label directs close monitoring of coagulation tests during concomitant use rather than avoidance outright. Discuss any new antibiotic course with the prescriber managing anticoagulation.

What the sources say

Warfarin Sodium Tablets — FDA Prescribing Information — Amneal Pharmaceuticals LLC (via DailyMed, U.S. National Library of Medicine)Ciprofloxacin Tablet — FDA Prescribing Information — Rising Pharmaceuticals, Inc. (via DailyMed, U.S. National Library of Medicine)

Last reviewed 2026-08-23

Medical information disclaimer: this information is general and educational. It does not diagnose conditions, prescribe treatment, or determine whether a combination is safe for you personally. Follow your prescription label and ask a pharmacist or clinician before starting, stopping, or combining products. Full disclaimer.

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