FDA Standards For Levothyroxine Bioequivalence, Substitution May Lead To Adverse Effects

... Levothyroxine sodium (LT4), marketed as Unithroid, Synthroid, Levoxyl, and Levothroid, is the principal form of thyroid hormone replacement taken by 13 million Americans. The FDA's current system governing dispensing and substitution of the currently available eight proprietary and generic levothyroxine preparations is confusing for physicians, patients, and pharmacists. [click link for full article] ...