names include "Thyrax", "Euthyrox", "Levaxin", "L-thyroxine" and "Eltroxin" in Europe, "Eutirox" in Mexico and "Levoxyl" and "Synthroid" in the United States. There are also numerous generic versions approved by the Food and Drug Administration . Uses This medicine is a hormone replacement usually given to patients with thyroid problems, specifically, hypothyroidism