Most healthy people should have no adverse effects when taking coenzyme Q--10, but others may experience stomach problems, diarrhea and nausea. In some cases, this supplement may also cause a skin rash or lower blood pressure, states WebMD. Because there is not enough scientific studies on this supplement's effect on pregnant and lactating women, the recommendation is to avoid its use, notes the University of Maryland Medical Center.
Coenzyme Q-10 can have interactions with many different medications, including blood thinners, hypertension medicines, chemotherapy drugs, statins and beta- blockers, states the University of Maryland Medical Center. The use of coenzyme Q- 10 along with these medications may render them less effective.
Coenzyme Q-10 is an antioxidant. It is a widely used supplement purportedly useful to treat certain medical conditions, such as heart failure, cholesterol, hypertension and diabetes. There are a few clinical studies that suggest that this supplement may be possibly effective for some conditions such as hypertension and gum disease, notes the University of Maryland Medical Center. However, more studies are necessary.