Levothyroxine is the generic name of T4 meds of which there are numerous
brands, including the following. Each of these
brands contain thyroxine, but differ in the filler material used in manufacture of the pills.
Eltroxin
Estre
Euthyrox
Levo-T
Levotabs
Levothroid
Levoxyl
Novothyrox
Synthroid
Thyrox
Unithroid
There is also a new one that is a gelcap of thyroxine, with no filler. It is called Tirosint.