Safety:
No reported allergy associated with Coenzyme Q10 supplements, although rash and itching have been reported rarely. Stop use two weeks before surgery/dental/diagnostic procedures with bleeding risk and do not use immediately after these procedures. Use caution if history of blood clots, diabetes, high blood pressure, heart attack, or stroke, or with anticoagulants (blood thinners) or antiplatelet drugs (like aspirin, warfarin, clopidogrel (like Plavix®), blood pressure, blood sugar, cholesterol or thyroid drugs. Avoid if pregnant or breastfeeding.
Possible side effects:
Bleeding, blood clots, breathing problems, bruising, dizziness, fatigue, flu-like symptoms, headache, irritability, itching, liver enzymes changes, sensitivity to light, skin rash, sleep changes, stomach upset, thyroid hormones changes.
Possible interactions:
Anticoagulants (blood thinners) or antiplatelet drugs like (aspirin, warfarin, clopidogrel (like Plavix®)), beta blockers, clonidine, methyldopa, hydralazine, antidepressants, antipsychotics, blood pressure drugs, blood sugar medications (insulin, metformin (Glucophage®)), cholesterol-lowering drugs (statins), some diuretics (water pills), ginkgo, garlic, horsetail, red yeast, vitamin E, vitamin K and other herbs or supplements with similar effects.
Dosing:
Adults (18 years and older):
Alzheimer's disease: 120mg has been taken by mouth three times daily, or 60mg daily with 150mg of iron and 180mg of vitamin B6 has been taken.
Heart failure/cardiomyopathy: 100-600mg, or 2mg (per kilogram of body weight) has been taken by mouth daily.
High blood pressure: 75-360mg has been taken by mouth daily.
Muscular dystrophies: 100mg by mouth in divided doses has been suggested.
Parkinson's disease: 300-1200mg has been taken daily.
Children (younger than 18 years):
For reducing heart damage by chemotherapy drugs, 100mg taken by mouth twice daily has been used.
For mitral valve prolapse (heart murmur) 3.0-3.4mg/kg has been taken by mouth daily.