MODERATE — Monitor Closely
🟡 USE CAUTION — Warfarin and Amoxicillin may interact. Talk to your doctor before combining.
Evidence level: MODERATE
Antibiotics like amoxicillin can increase warfarin's effect by killing gut bacteria that make vitamin K. Monitor INR.
Antibiotics disrupt gut flora that produce vitamin K → may increase warfarin sensitivity and INR.
The interaction between Warfarin and Amoxicillin is manageable with awareness. Talk to your doctor or pharmacist, especially if you notice any new or unusual symptoms after combining them.
Space Warfarin at least 2 hours from Amoxicillin. Follow antibiotic-specific food instructions carefully. Complete the full antibiotic course even if symptoms improve.
Higher risk with: older age (65+), history of GI bleeding, concurrent use of multiple blood-thinning agents, liver disease, heavy alcohol use, recent surgery.
Watch for unusual bruising, bleeding gums, nosebleeds, blood in urine or stool, prolonged bleeding from cuts. Report any of these to your doctor immediately.
Mention this combination at your next appointment. Ask: "Should I adjust timing or doses of Warfarin and Amoxicillin?" Your doctor may want to monitor specific lab values.
This medication combination requires careful medical oversight. Your doctor or anticoagulation clinic can adjust doses or select alternatives with fewer bleeding risks. Frequent INR monitoring is essential.
Antibiotics like amoxicillin can increase warfarin's effect by killing gut bacteria that make vitamin K. Monitor INR.
Space Warfarin at least 2 hours from Amoxicillin. Follow antibiotic-specific food instructions carefully. Complete the full antibiotic course even if symptoms improve.
Watch for unusual bruising, bleeding gums, nosebleeds, blood in urine or stool, prolonged bleeding from cuts. Report any of these to your doctor immediately.
This medication combination requires careful medical oversight. Your doctor or anticoagulation clinic can adjust doses or select alternatives with fewer bleeding risks. Frequent INR monitoring is essential.
Mention this combination at your next appointment. Ask: "Should I adjust timing or doses of Warfarin and Amoxicillin?" Your doctor may want to monitor specific lab values.
Or browse the full interaction database (121,000+ pairs).