The FDA is still considering whether it is safe for people to use Merck & Co.'s cholesterol-lowering drug Mevacor without a prescription, as the drugmaker prepares for its third attempt to market the product as an over-the-counter treatment. Merck's consumer comprehension tests failed to show "that there is adequate consumer comprehension of the proposed product label to ensure safe and effective use of this product," according to a preliminary FDA review.

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