The U.S. Pharmacopeial Convention is working with the FDA and the Consumer Healthcare Products Association to update the quality standards for common medicines. It's part of a USP plan to assess drug data in the USP and National Formulary compendia, with an eye toward updating test procedures to keep pace with technology. On the common-medication list is acetaminophen, among the highest-volume OTC drugs and also used in prescription meds. The FDA has recommended a test for impurities and degradants in products containing the ingredient. USP release