Drug Interaction Report

Heparin Injection and Coenzyme Q10: Interaction Details

A pharmacist-reviewed analysis of the Heparin Injection and Coenzyme Q10 interaction: the documented clinical effects, severity rating, onset, mechanism, and management considerations, with cited references throughout.

AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature

Heparin Injection

Lipo-Hepin® Liquaemin® Panheparin®
+

Coenzyme Q10

No brand names on record
Dr. Brian Staiger, PharmD, BCPS
Medically reviewed by
Dr. Brian Staiger, PharmD, BCPS
Updated Aug 8, 2026
Editorial policy · Data sources
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Interaction severity
Moderate
Can be significant — usually manageable with monitoring.
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.

Of 193 documented Heparin Injection interactions, 43 are rated moderate — including this one.
Onset
delayed
Evidence
probable
Severity
Moderate

What happens

Reduced anticoagulant effectiveness

Interaction Deep Dive

Case reports associate coenzyme Q10 therapy with decreased INR in patients taking warfarin1. Coenzyme Q10 had no effect on the INR in patients stable on warfarin in a randomized, double-blind, placebo-controlled, crossover trial 3.

Why it happens (mechanism)

Similar chemical structure of coenzyme Q10 and vitamin K2

Literature reports

2 reports — tap to read

a) Three patients were reported to have a decrease in the international normalized ratio (INR) after addition of ubidecarenone (coenzyme Q10) to their warfarin regimens. A 68-year-old man with a stable INR of 2 to 3.5 on warfarin had an INR of 1.31 after two weeks of taking ubidecarenone 30 mg daily. Ubidecarenone was discontinued and the INR subsequently remained therapeutic. A 72-year-old man developed a pulmonary embolism after three months of taking ubidecarenone. A 70-year-old woman stable on warfarin for several years had an INR of 1.42 after two weeks of taking ubidecarenone 30 mg daily. Her INR returned to the therapeutic range after discontinuation of ubidecarenone and a temporary increase in warfarin dosage 2.

b) Coenzyme Q10 did not affect the international normalized ratio (INR) in a randomized, double-blind, placebo-controlled, crossover trial of 24 patients stable on warfarin. Patients received coenzyme Q10 100 milligrams (mg) daily in addition to their regular warfarin therapy for four weeks, then crossed over to placebo after a two-week washout. The geometric mean warfarin dose remained the same and INR was unaffected during treatment 3.

Common questions

Can I take Heparin Injection and Coenzyme Q10 together?

Reduced anticoagulant effectiveness Always confirm with your pharmacist or prescriber before making any change.

How serious is the Heparin Injection and Coenzyme Q10 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 "probable". Good supporting evidence, though not definitively proven.

Questions for your pharmacist

  • Does my dose of Heparin Injection or Coenzyme Q10 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 (3)

  1. Spigset O: Reduced effect of warfarin caused by ubidecarenone. The Lancet 1994; 344:1372-3.
  2. Spigset O: Reduced effect of warfarin caused by ubidecarenone. Lancet 1994; 344:1372-1373. PubMed
  3. Engelsen J, Nielsen JD, & Hansen KF: Effect of coenzyme Q10 and gingko biloba on warfarin dosage in patients on long-term warfarin treatment. A randomized, double-blind, placebo-controlled cross-over trial (Abstract-Article in Danish). Ugeskr Laeger 2003; 165(18):1868-1871.
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Heparin Injection

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