Synthroid comes as a tablet that’s taken by mouth. The tablets come in different colors depending on which strength they are. Typically, your doctor will start by prescribing a low dosage level.

restart at lower dose. Myxedema coma: use IV levothyroxine. Adults: Monitor TSH 6–8 weeks after dose change then every 6–12 months when stable. Peds: Monitor TSH and total or free-T4 at 2 and ...