Calcium channel blockers

Common tablets

Diltiazem, Amlodipine, Nifedipine, Verapamil, Nicardipine

Why are they used?

Calcium channel blockers are mainly used for: reducing angina; lowering a raised blood pressure; or controlling fast heart beats.

How do they work?

These tablets block the movement of calcium in and out of heart muscle cells. This relaxes and enlarges the blood vessels and reduces the workload of the heart. This lowers the blood pressure and relieves angina symptoms. Certain tablets (verapamil) slow the heart rate and reduce the risk of particular fast heart beats.

What to look out for

Initially taking a calcium channel blocker, patients may often experience headaches, feel lethargic or have slight flushing. They usually only last a few days. If these symptoms persist, you must contact your doctor.
Slight ankle swelling and constipation. If these particularly bother you, contact your doctor.

Special instructions

Please take these tablets whole, with or after food. Do not chew or crush them. Do not stop taking these suddenly.