What are beta-blockers? How do they interact with other drugs?

Quick Answer
Medications used to treat hypertension and a variety of heart conditions.
Expert Answers
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Coenzyme Q10 (CoQ10)

Effect: Supplementation Possibly Helpful

There is some evidence that beta-blockers (specifically propranolol, metoprolol, and alprenolol) might impair the body’s ability to utilize the substance CoQ10. This is particularly of concern, because CoQ10 appears to play a significant role in normal heart function. Depletion of CoQ10 might be responsible for some of the side effects of beta-blockers. In one study, CoQ10 supplements reduced side effects caused by the beta-blocker propranolol. The beta-blocker timolol may interfere with CoQ10 production to a lesser extent than other beta-blockers.


Effect: Possible Helpful Interaction

Beta-blockers have been known to reduce levels of HDL (good) cholesterol. According to one study, chromium supplementation can offset this adverse effect.

Coleus forskohlii

Effect: Theoretical Interaction

The herb Coleus forskohlii relaxes blood vessels and might have unpredictable effects on blood pressure if combined with beta-blockers.


Folkers, K. “Basic Chemical Research on Coenzyme Q10 and Integrated Clinical Research on Therapy of Diseases.” In Coenzyme Q: Biochemistry, Bioenergetics, and Clinical Applications of Ubiquinone, edited by G. Lenaz. New York: John Wiley & Sons, 1985.

Hamada, M., et al. “Correlation Between Serum Coq10 Level and Myocardial Contractility in Hypertensive Patients.” In Biomedical and Clinical Aspects of Coenzyme Q, Vol. 4, edited by K. Folkers. Amsterdam: Elsevier Science, 1984.

Roeback, J. R., et al. “Effects of Chromium Supplementation on Serum High-density Lipoprotein Cholesterol Levels in Men Taking Beta-blockers.” Annals of Internal Medicine 115 (1991): 917-924.