Difference between synthroid and eltroxin. L-thyroxine, Eltroxin and Thyrax Duotab in Europe; Thyrox in South Asia; Eutirox, Tirosint, Levoxyl and Synthroid in North America. . . What is the difference between a fu. . A: A difference only in the price. . . Thyroxine or Synthroid in the states is manufactured . . . . . . . . . . . . These include Synthroid, Levothyroxine and Armour to . A reformulation of the GlaxoSmithKline drug Eltroxin, a levothyroxine drug used to . . there is always a bit ... more