top of page
Search


Levothyroxine (Synthroid): How It Works, Dosage, TSH Targets and Complete Hypothyroidism Guide 2026
Levothyroxine is the USA's 3rd most prescribed drug — 102M Rx/yr. This 2026 FDA-updated guide covers why empty stomach matters (absorption 80% vs 40% with food), coffee and calcium 4-hour rules, dosing table by age and cardiac status, TSH targets for all scenarios, the black box weight-loss warning, myxedema coma from stopping, Synthroid vs generic resolved, and pregnancy dose increase rule.

Dr. Ryan Heals, Pharm.D.
6 days ago11 min read
bottom of page
