doxycycline vs rifampin
Side-by-side comparison of doxycycline and rifampin. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
moderate Known Drug Interaction
Doxycycline Administered with rifampin (10 mg/kg daily) Decrease exposure Irinotecan Administered with an antibiotic regimen including rifampin (450 mg/day), isoniazid (300 mg/day), and streptomycin (0.5 g/day) IM Prevention or Management: Avoid the use of rifampin, a strong CYP3A4 inducer, if possible.
Recommendation: Avoid taking these two drugs together if possible so the antibiotic can work correctly.
Vibramycin, Doryx
Rifadin
Doxycycline is an antibiotic medicine. It fights bacteria in your body to treat different kinds of infections.
Rifampin is an antibiotic medicine. It fights bacteria in your body to treat infections.
Doxycycline treats many types of infections caused by bacteria. This includes infections like Rocky Mountain spotted fever, typhus, Q fever, and certain respiratory infections. It also treats sexually transmitted infections like gonorrhea and chlamydia, as well as other infections like plague and tularemia.
Rifampin treats tuberculosis (TB) and helps eliminate the bacteria that cause meningitis from your nose and throat. It is important to use rifampin only for infections that are proven or strongly suspected to be caused by bacteria. This helps to prevent bacteria from becoming resistant to the medicine.
Doxycycline belongs to a class of drugs called tetracycline antibiotics. It works by stopping the growth of bacteria. This helps your body fight off the infection.
Rifampin works by stopping bacteria from growing and multiplying. It does this by blocking a key enzyme that the bacteria need to make proteins. This helps your body fight off the infection.
- • Nausea
- • Vomiting
- • Diarrhea
- • Rash
- • Photosensitivity (increased sensitivity to sunlight)
- • Heartburn
- • Upset stomach
- • Loss of appetite
- • Nausea
- • Vomiting
- Feeling sick to your stomach 4,770
- Feeling tired 4,419
- Skin irritation 3,946
- Loose, watery stools 3,844
- Discomfort 3,832
- Drug Interaction 970
- Drug Reaction With Eosinophilia And Systemic Symptoms 727
- Nausea 628
- Condition Aggravated 550
- Pyrexia 541
Doxycycline can cause permanent tooth discoloration if used during tooth development (pregnancy, infancy, childhood up to 8 years old). It can also cause increased pressure inside the skull. Tell your doctor right away if you have blurred vision, double vision, or a severe headache.
Rifampin can cause liver problems. Tell your doctor right away if you have yellowing of the skin or eyes, dark urine, or stomach pain. Rifampin can also cause blood problems. Tell your doctor if you have unusual bleeding or bruising.
Doxycycline can harm an unborn baby. Do not use this medicine if you are pregnant. Doxycycline can pass into breast milk and may affect bone and tooth development in the nursing infant. Talk to your doctor about the best way to feed your baby if you are taking this medicine.
Tell your doctor if you are pregnant or plan to become pregnant. Rifampin can make birth control pills less effective, so use other forms of birth control. Talk to your doctor if you are breastfeeding.
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How to Read This doxycycline vs rifampin Comparison
doxycycline is classified in the Tetracycline Antibiotic drug class, while rifampin sits within the Rifamycin Antibiotic 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, doxycycline has 20,811 submissions while rifampin has 3,416. 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 moderate interaction flagged in FDA labeling, attributed to rifampin speeds up how quickly your body breaks down doxycycline, which makes the antibiotic less effective at fighting infections.. 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 doxycycline and rifampin - 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.