Discussions that mention synthroid

Thyroid Disorders board

Some folks have reactions to certain binders/fillers used in meds, so I thought that I could help out by researching which inactive ingredients are in which thyroid meds. (the list of dyes for each manufacturer and each dose was enormous so I didn’t include it here. However, for those that have a problem with dyes, it’s good to know that the 50 mcg dose for synthetic T4 is dye-free. As far as I know, Armour uses only opadry white for all of its doses.)

This is the most current information I could find and is directly from manufacturers websites or from the FDA Drug Approval website. I hope you find this info useful.


ARMOUR THYROID (natural T4/T3) – calcium stearate, dextrose, microcrystalline cellulose, sodium starch glycolate, opadry white

CYTOMEL (synthetic T3) – calcium sulfate, gelatin, starch, stearic acid, sucrose, talc.

GENERIC LEVOTHYROXINE SODIUM MFG BY MYLAN (synthetic T4) – butylated hydroxyanisole, colloidal silicon dioxide, crospovidone, ethyl alcohol, magnesium stearate, mannitol, microcrystalline cellulose, povidone, sodium lauryl sulfate, sucrose

LEVOTHROID (synthetic T4) – microcrystalline cellulose, calcium phosphate dibasic, povidone, magnesium stearate

LEVOXYL (synthetic T4) – microcrystalline cellulose, croscarmellose sodium, magnesium stearate

SYNTHROID (synthetic T4) – acacia, confectioner’s sugar (contains cornstarch), lactose monohydrate, magnesium stearate, povidone, talc

THYROLAR (synthetic T4/T3) – calcium phosphate, colloidal silicon dioxide, corn startch lactose, magnesium stearate.

UNITHROID (synthetic T4) – colloidal silcon dioxide, lactose, magnesium stearate, microcrystalline cellulose, cornstarch, acacia, sodium starch glycolate