Kindly explain me what are the side effects of diltiazem & verapamil?

Check online referen. Diltiazem & verapamil are 2 calcium channel blockers used to lower blood pressure & possibly control your heart rate. If your BP is too low or heart rate is too slow, you might feel weak & faint. These medications can also cause constipation. Check out online.Epocrates.Com & drugs.Com for more info regarding any medication. Ask pharmacist as well as prescribing physician why this particular drug.