They are often used alongside angiotensin-converting enzyme inhibitors, such as Accupril, Zestril and Prinivil.

FORBES: Pfizer's Heart Failure Flop

Instead, Merck is grappling with patent expirations for cardiac drugs like Prinivil and Mevacor.

FORBES: Magazine Article

But Merck doesn't have much experience in central nervous system drugs, whose success is more difficult to judge than heart drugs like Mevacor, Prinivil and Zocor.

FORBES: Magazine Article

By June, it will lose patent protection on four drugs--Vasotec and Prinivil for hypertension, Mevacor for high cholesterol and Prilosec, which it shares with AstraZeneca (nyse: AZN - news - people), for ulcers.

FORBES: Magazine Article