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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