Recent Blog Articles

Ask the doctor: Do calcium supplements counteract calcium-channel blockers?

December 1, 2008

Ask the doctor

Do calcium supplements counteract calcium-channel blockers?

Q. My doctor started me on a calcium-channel blocker for high blood pressure. I also take a daily calcium supplement for my bones. Will that counteract the drug's effect?

A. You don't need to worry about taking a daily calcium supplement with a calcium-channel blocker. While high doses of intravenous calcium are sometimes used to reverse an overdose of a calcium-channel blocker, the amount of calcium in a daily supplement isn't enough to interfere with the drug's ability to lower blood pressure. In fact, in some people, an oral calcium supplement actually lowers blood pressure around one or two points. Since the effect is so small, oral calcium isn't recommended for treating high blood pressure.

To continue reading this article, you must log in.

Subscribe to Harvard Health Online for immediate access to health news and information from Harvard Medical School.

  • Research health conditions
  • Check your symptoms
  • Prepare for a doctor's visit or test
  • Find the best treatments and procedures for you
  • Explore options for better nutrition and exercise
Learn more about the many benefits and features of joining Harvard Health Online »

I'd like to receive access to Harvard Health Online for only $4.99 a month.

Sign Me Up

Already a member? Login ».


As a service to our readers, Harvard Health Publishing provides access to our library of archived content. Please note the date of last review or update on all articles.

No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinician.

Free Healthbeat Signup

Get the latest in health news delivered to your inbox!

Harvard Health Publishing Logo

Thanks for visiting. Don't miss your FREE gift.

The Best Diets for Cognitive Fitness, is yours absolutely FREE when you sign up to receive Health Alerts from Harvard Medical School

Sign up to get tips for living a healthy lifestyle, with ways to fight inflammation and improve cognitive health, plus the latest advances in preventative medicine, diet and exercise, pain relief, blood pressure and cholesterol management, and more.

Harvard Health Publishing Logo

Health Alerts from Harvard Medical School

Get helpful tips and guidance for everything from fighting inflammation to finding the best diets for weight loss...from exercises to build a stronger core to advice on treating cataracts. PLUS, the latest news on medical advances and breakthroughs from Harvard Medical School experts.

BONUS! Sign up now and
get a FREE copy of the
Best Diets for Cognitive Fitness

Harvard Health Publishing Logo

Stay on top of latest health news from Harvard Medical School.

Plus, get a FREE copy of the Best Diets for Cognitive Fitness.