have their own inactive ingredients, plus dyes and all the generics have the same active ingredient
T4. If a person is sensitive they might have a reaction from the inactive ingredients
or dyes from any of the brands, as well as Levothyroixne, Armour, Cytomel or the equivalent. The FDA has determined that generic Levothyroxine and brand-name Synthroid and Levoxyl are equivalent. The FDA requires all drugs, both brand-names and their generic counterparts, to be proven safe and effective.