Brand name(s)

Cardizem, Cartia XT, Dilacor XR, Dilt-CD, Diltia XT, Diltzac, Matzim LA, Taztia XT, Tiazac

What it is

Cardizem (diltiazem) is a calcium channel blocker. It works by relaxing the muscles of your heart and blood vessels.

What it treats

Cardizem is used to treat hypertension (high blood pressure). It may be used alone or in combination with other high blood pressure medications. Cardizem is also used to treat chronic stable angina (chest pain) and angina due to coronary artery spasm.