Home > Patients & Visitors > Health Library > Calcium Channel Blockers for High Blood Pressure
Calcium channel blockers relax and widen
blood vessels. This makes it easier for blood to flow through the vessels and
lowers blood pressure.
Diltiazem and verapamil also slow the heart
rate and affect the pumping action of the heart.
Calcium channel blockers are used to lower high blood pressure. This medicine can be taken either alone or with other blood pressure medicines such as a diuretic.
Calcium channel blockers lower blood pressure and help prevent a heart attack or stroke.footnote 1
All medicines have side effects. But many people don't feel the side effects, or they are able to deal with them. Ask your pharmacist about the side effects of each medicine you take. Side effects are also listed in the information that comes with your medicine.
Here are some important things to think about:
Call 911 or other emergency services right away if you have:
Call your doctor if you have:
Common side effects of this medicine include:
See Drug Reference for a full list of side effects. (Drug
Reference is not available in all systems.)
Your doctor may ask you to take your pulse regularly to make sure your heart rate is not too slow. To learn how to take your pulse, see the topic Taking a Pulse (Heart Rate).
For tips on taking blood pressure medicine, see:
Medicine is one of the many tools your doctor has to treat a health problem. Taking medicine as your doctor suggests will improve your health and may prevent future problems. If you don't take your medicines properly, you may be putting your health (and perhaps your life) at risk.
There are many reasons why people have trouble taking their medicine. But in most cases, there is something you can do. For suggestions on how to work around common problems, see the topic Taking Medicines as Prescribed.
If you are pregnant, breast-feeding, or trying to get pregnant, do not use any medicines unless your doctor tells you to. Some medicines can harm your baby. This includes prescription and over-the-counter medicines, vitamins, herbs, and supplements. And make sure that all your doctors know that you are pregnant, breast-feeding, or planning to get pregnant.
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments. And call your doctor if you are having problems. It's also a good idea to know your test results and keep a list of the medicines you take.
Complete the new medication information form (PDF)(What is a PDF document?) to help you understand this medication.
Drugs for hypertension (2012). Treatment Guidelines From The Medical Letter, 10(113): 1–10.
ByHealthwise StaffPrimary Medical ReviewerE. Gregory Thompson, MD - Internal MedicineSpecialist Medical ReviewerRobert A. Kloner, MD, PhD - Cardiology
Current as ofFebruary 20, 2015
Current as of:
February 20, 2015
E. Gregory Thompson, MD - Internal Medicine & Robert A. Kloner, MD, PhD - Cardiology
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