Norvasc is prescribed for angina, a condition characterized by episodes of crushing chest pain that usually results from a lack of oxygen in the heart muscle due to clogged arteries. Norvasc is also prescribed for high blood pressure. It is a type of medication called a calcium channel blocker. These drugs dilate blood vessels and slow the heart to reduce blood pressure and the pain of angina.

If you have high blood pressure, you must take Norvasc regularly for it to be effective. Since blood pressure declines gradually, it may be several weeks before you get the full benefit of Norvasc; and you must continue taking it even if you are feeling well. Norvasc does not cure high blood pressure; it merely keeps it under control.

Norvasc may be taken with or without food. A once-a-day medication, Norvasc may be used alone or in combination with other drugs for high blood pressure or angina.

You should take this medication exactly as prescribed, even if your symptoms have disappeared. You will begin to see a drop in your blood pressure 24 hours after you start the medication.

You can find an extensive list of recent scientific research abstracts about NORVASC here

Benazepril is used to treat high blood pressure. It decreases certain chemicals that tighten the blood vessels, so blood flows more smoothly.
This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.

Benazepril comes as a tablet to take by mouth. It is usually taken once or twice a day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take Benazepril exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.
Benazepril controls high blood pressure but does not cure it. Continue to take Benazepril even if you feel well. Do not stop taking Benazepril without talking to your doctor.

Fosinopril is used to treat high blood pressure and heart failure. It decreases certain chemicals that tighten the blood vessels, so blood flows more smoothly and the heart can pump blood more efficiently.
This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.

Fosinopril comes as a tablet to take by mouth. It is usually taken once or twice a day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take Fosinopril exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.
Fosinopril controls high blood pressure and heart failure but does not cure them. Continue to take Fosinopril even if you feel well. Do not stop taking Fosinopril without talking to your doctor.

Curr Opin Cardiol. 1999 Sep;14(5):375-80
New drugs for the treatment of hypertension.
Mancia G, Stella ML, Grassi G.
Cattedra di Medicina Interna, Universita di Milano, Ospedale San Gerardo, Monza, Italy.

Despite the many outstanding favorable results achieved in the treatment of hypertension, several unmet goals of antihypertensive therapy remain, such as better blood pressure control, greater protection against the organ damage associated with hypertension, better tolerability, and ultimately a more effective prevention of cardiovascular disease. These unmet goals are the reasons why new antihypertensive drugs are synthesized and tested in the clinical practice. This paper briefly mentions the goals of new antihypertensive agents and examines the main pharmacological and clinical features of new classes of antihypertensive drugs, such as angiotensin II receptor blockers, central agents, vasopeptidase inhibitors, and endothelin antagonists. The results of experimental and clinical studies with these new drugs are reviewed, emphasizing some advantages and potential disadvantages of these drugs compared with traditional antihypertensive drugs.