Minocycline Topical and Dicumarol: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Minocycline Topical
Dicumarol
No brand names on record
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
What happens
Increased risk of bleeding
Interaction Deep Dive
Tetracycline therapy has been shown to reduce plasma prothrombin activity12345. However, clinical reports of interactions with oral anticoagulants are lacking.
Why it happens (mechanism)
Unknown
Common questions
Can I take Minocycline Topical and Dicumarol together?
Increased risk of bleeding Always confirm with your pharmacist or prescriber before making any change.
How serious is the Minocycline Topical and Dicumarol interaction?
It is rated moderate. Can be significant — usually manageable with monitoring.
How quickly could this interaction happen?
The documented onset is "delayed". Effects tend to build up gradually over days to weeks.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
Questions for your pharmacist
- Does my dose of Minocycline Topical or Dicumarol need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there anything you'd monitor while I'm on both?
References (5)
- Westfall LK, Mintzer DL, & Wiser TH: Potentiation of warfarin by tetracycline (letter). Am J Hosp Pharm 1980; 37:1620. DOI
- Finegold SM: Interaction of antimicrobial therapy and intestinal flora. Am J Clin Nutr 1970; 23:1466. PubMed
- Martin WJ: Hemorrhagic diathesis induced by antimicrobials. JAMA 1968; 205:192.
- Messinger WJ: The effect of a bowel sterilizing antibiotic on blood coagulation mechanisms. Angiology 1965; 16:29. DOI
- Searcy RL, Simms NM, Foreman JA, et al: Evaluation of the blood-clotting mechanism in tetracycline-treated patients. Antimicrob Agents Chemother 1964; 10:179-183.
Keep reading about Minocycline Topical
Keep reading about Dicumarol
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