FDA and its re­search take aim at thy­roid as­so­ci­a­tion's guide­line on not us­ing levothy­rox­ine gener­ics

Gener­ic drugs rep­re­sent the vast ma­jor­i­ty of all drugs pre­scribed in the US.

But in some unique cas­es, the FDA ac­knowl­edges that there are doc­tors who are con­cerned about drugs with a nar­row ther­a­peu­tic win­dow (i.e., as the FDA says, “drugs where small dif­fer­ences in dose or blood con­cen­tra­tion may lead to se­ri­ous ther­a­peu­tic fail­ures or ad­verse drug re­ac­tions”), and there­fore may be more like­ly to pre­scribe brand-name prod­ucts over gener­ics in some cas­es.

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