DisclosureWe earn commission on partner links; ranking is set by our published methodology — not advertisers.
The label's direction is the opposite of the old advice here: semaglutide INCREASES levothyroxine exposure (by 33% in a drug-interaction study), it does not reduce it. Have your TSH checked after starting or changing dose.
Semaglutide delays gastric emptying, which can change how oral drugs are absorbed. In a drug-interaction study with the semaglutide tablet, levothyroxine exposure was increased 33%; the label advises increased clinical or laboratory monitoring for drugs that require it — for levothyroxine, a TSH check. Do not adjust your levothyroxine dose on your own; work with your prescriber, who will use your TSH result to decide whether any change is needed.
Editorial answer verified against FDA labeling and peer-reviewed trials, with sources cited. Not medical advice. Coordinate treatment decisions with your prescriber.