Calcium channel blockers reduce the heart's need for oxygen by dilating the arteries, hence reducing the pressure in them.
Regular Websites
iVillage: Calcium Channel Blockers
Consists of a summary about CCBs, conditions treated, conditions of concern, and symptoms of overdose, as well as lifestyle considerations and pediatric usage. - iVillage: Calcium Channel Blockers
http://yourtotalhealth.ivillage.com/calcium-channel-blockers.html
Mayo Clinic: Calcium Channel Blockers
Expert information about calciu channel blockers or calcium antagonists, examples of these agents, an a list of other uses for them. - Mayo Clinic: Calcium Channel Blockers
http://www.mayoclinic.com/health/calcium-channel-blockers/HI00061
The official site of Novasc showcases details about the conditions of hypertension and angina, prescribing information, and safety information. - Norvasc
http://www.norvasc.com/high-blood-pressure-medicine/index.asp