moxifloxacin vs warfarin
Side-by-side comparison of moxifloxacin and warfarin. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
minor Known Drug Interaction
( 2.2 , 7.1 , 12.3 ) Warfarin Anticoagulant effect enhanced. 7.2 Warfarin Fluoroquinolones, including moxifloxacin hydrochloride, have been reported to enhance the anticoagulant effects of warfarin or its derivatives in the patient population. Therefore the prothrombin time, International Normalized Ratio (INR), or other suitable anticoagulation tests should be closely monitored if moxifloxacin hydrochloride is administered concomitantly with warfarin or its derivatives [see Adverse Reactions (6.2) and Clinical Pharmacology (12.3) ].
Recommendation: Your doctor should perform regular blood tests to check your clotting levels while you are taking both medications.
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Moxifloxacin is an antibiotic that fights bacteria in your body. It is used to treat different types of infections.
Warfarin is a medicine that helps prevent blood clots. It is used to treat and prevent dangerous clots from forming in your body.
Moxifloxacin treats infections like pneumonia, skin infections, and infections in your stomach area. It can also treat sinus infections, bronchitis, and plague. This medicine should only be used to treat infections that are proven or very likely to be caused by bacteria that it can kill.
Warfarin is used to prevent and treat blood clots in your veins and lungs. It can also prevent clots if you have atrial fibrillation (irregular heartbeat) or a replacement heart valve. After a heart attack, it can lower the risk of death, another heart attack, or a stroke.
Moxifloxacin belongs to a class of drugs called fluoroquinolones. It works by stopping bacteria from multiplying. This helps your body fight off the infection.
Warfarin works by blocking your body's use of vitamin K. Vitamin K is needed to make blood clotting factors. By blocking vitamin K, warfarin makes your blood less likely to clot.
- • Nausea
- • Diarrhea
- • Headache
- • Dizziness
- • Bleeding from any tissue or organ
- Dyspnoea 1,224
- Pneumonia 1,142
- Vomiting 1,101
- Drug Hypersensitivity 1,073
- Asthma 910
- INR increased 10,275
- Shortness of breath 8,408
- Interaction with another medicine 6,289
- Tiredness 6,141
- Feeling sick to your stomach 5,921
Moxifloxacin can cause serious side effects, even if they don't happen to everyone. These include tendon problems, nerve damage, and central nervous system problems. If you have myasthenia gravis, moxifloxacin can make your muscle weakness worse. If you experience any of these serious side effects, stop taking moxifloxacin immediately and talk to your doctor. Because of these risks, moxifloxacin should only be used when other treatment options are not available for sinus infections or bronchitis.
Warfarin can cause major or fatal bleeding. You must have your blood tested regularly (INR) while taking warfarin. Many things, like other medicines and diet changes, can affect your INR. Tell your doctor about any bleeding and follow their instructions to prevent bleeding.
Talk to your doctor if you are pregnant or plan to become pregnant. Moxifloxacin may harm your unborn baby. It is not known if moxifloxacin passes into breast milk, so talk to your doctor if you are breastfeeding.
Warfarin can harm your unborn baby, especially during the first three months of pregnancy. Do not take warfarin if you are pregnant, unless you have a mechanical heart valve and your doctor says the benefits outweigh the risks. Talk to your doctor if you are breastfeeding, and watch your baby for bruising or bleeding.
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How to Read This moxifloxacin vs warfarin Comparison
moxifloxacin is classified in the Fluoroquinolone Antibiotic drug class, while warfarin sits within the Vitamin K Antagonist (Anticoagulant) class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, moxifloxacin has 5,450 submissions while warfarin has 37,034. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known minor interaction flagged in FDA labeling, attributed to moxifloxacin can increase the blood-thinning effects of warfarin, which makes it easier for you to bleed or bruise.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between moxifloxacin and warfarin - always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.