Coenzyme Q10 (ubidecarenone)
Herbal products and dietary supplements
Herbal products and dietary supplements
A mitochondrial electron carrier (ubiquinone) sold as a supplement. Statins lower its levels, yet it has not been shown to ease statin muscle pain.
Also called: Ubidecarenone, Ubiquinone, CoQ10
Quick facts
- Group
- Herbal products and dietary supplements
- Target
- Mitochondrial electron transport chain (as its own carrier)
- Used for
- Heart failure · Statin-associated muscle pain
- Key effects
- Insomnia · Digestive upset
- Monitor
- INR in patients on warfarin
- ATC
- C01EB09
No doses: the clinician sets them by the current guideline.
Mechanism of action
Coenzyme Q10 (ubiquinone) carries electrons from complexes I and II to complex III in the inner mitochondrial membrane and acts as an antioxidant; the reduced form, ubiquinol, predominates in the blood. The body makes it through the mevalonate pathway, so statins, which block HMG-CoA reductase, lower its levels. Supplements were proposed to support heart muscle and prevent statin myopathy, but the clinical evidence is inconclusive or negative.
- CoQ10 is made via the mevalonate pathway
- It shuttles electrons to complex III in mitochondria
- Statins block HMG-CoA reductase and lower CoQ10
- Supplements raise levels; clinical benefit unproven
Indications
- Heart failure: research is inconclusive Heart failure →
- Statin-associated muscle pain: the overall evidence does not support it
Adverse effects
Common
- Insomnia
- Digestive upset
Contraindications
- Use with warfarin without INR monitoring
- During some cancer treatments without the oncology team's advice
Key interactions
- Warfarin
- Its vitamin K-like structure may reduce warfarin's effect
- Insulin
- Possible interaction; glucose is watched
- Statins
- Statins lower CoQ10 levels; supplementation has not been shown to prevent statin muscle pain
What is monitored
- INR in patients on warfarin
- Blood glucose in patients on insulin
Pregnancy and breastfeeding
Safety in pregnancy has not been established.
Nursing care
- Ask every patient about herbal products and supplements and record them with the medicine list
- Check INR when a patient on warfarin starts or stops coenzyme Q10
- Teach that «natural» does not mean safe and that supplements are not approved as medicines before sale
Pharmacokinetics
- Absorption
- Taken by mouth
- Distribution
- Present in the mitochondria of heart, kidney, liver and muscle; circulates mainly as ubiquinol
Test yourself
Think of the answer, then tap the question to see it.
Why do statins lower coenzyme Q10 levels?
CoQ10 is made through the mevalonate pathway, which starts at HMG-CoA reductase, the enzyme statins block.
What is the role of coenzyme Q10 in the mitochondria?
It carries electrons from complexes I and II to complex III and acts as an antioxidant.
How can coenzyme Q10 affect warfarin therapy?
It resembles vitamin K and may reduce warfarin's effect.
Connections
← Back to the class: Herbal products and dietary supplements
Educational content on how drugs work; not a prescribing guide and no substitute for a health professional's advice. No doses are given.
Sources: Coenzyme Q10 (National Center for Complementary and Integrative Health (NCCIH), 2019); ATCDDD - ATC/DDD Index (WHO Collaborating Centre for Drug Statistics Methodology, 2026).
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Representative model, for educational purposes only.