The most widely used type of blood pressure drug may do more harm than good for your heart, according to a major new study.
A research team led by Pennsylvania State University looked at L-type calcium channel blockers (LCCBs). These include verapamil (Calan, Isoptin) and diltiazen (Cardizem).
LCCBs work by keeping excessive calcium from entering blood vessel cells. Too much calcium causes the vessels to become thick and stiff, which raises blood pressure.