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Blood-Pressure Drug With Thousands of Complaints Draws FDA Test

U.S. regulators plan an extensive study of blood-pressure drugs that generate almost 40 million prescriptions a year, after receiving thousands of complaints from doctors and patients.

Generics of AstraZeneca Plc’s extended release Toprol XL make up about 90 percent of physicians’ orders for the drug. The copycat drugs are made by Wockhardt Ltd. and Dr. Reddy’s Laboratories Ltd., both of which are based in India, and Mylan Inc. and Actavis Plc in the U.S.