Good morning
I'm abroad and instead of Letrox, I was given T4-Thyro here. Can I actually use it as a substitute?
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Joanna Dunajska Pharmacist, Editor
17 months ago
Letrox and T4-thyro contain the same active ingredient, levothyroxine sodium. They are their counterparts, they can be used interchangeably.
I've attached materials that you may find interesting: