1.   American Home Products Corp. withdrew two of its diet drugs from the market after they were linked to heart damage in a high proportion of patients.

2.   Last September the company had to withdraw Redux from the market after the drug was linked to heart valve problems.

3.   The agency in September asked American Home to withdraw its fenfluramine and Redux drugs after they were linked to heart valve problems.

4.   The second drug in Redux, phentermine, was not linked to heart valve problems.

5.   Vioxx also has been scrutinized for data that some say suggests a possible link to heart attacks, though Merck disputes that conclusion.