Efficacy of Blood Pressure Drug Questioned 05 Nov 2004 Source: Reuters By Patricia Reaney LONDON, Nov 5 (Reuters) - A leading drug used by millions of people to lower blood pressure does not prevent deaths from heart attacks or other cardiovascular problems as well as other treatments, researchers said on Friday. Atenolol, which is sold under the brand name Tenormin by drugs giant AstraZeneca , was first introduced in 1976. It is one of the most widely prescribed drugs of its kind. But Swedish scientists have questioned its benefits after reviewing the results of nine previous studies of the drug....