Two things can shift your thyroid needs during weight loss: Absorption variability (especially early on with dose increases) BNF Body weight changes (thyroid replacement dose requirements can change as weight changes) A practical approach many clinicians use is: Check TSH ( free T4) about 68 weeks after : starting tirzepatide, or a significant dose escalation, or a big, sustained drop in weight NICE also flags that because tirzepatide delays gastric emptying, some oral medicines (particularly those with a narrow therapeutic index) may need monitoring during escalation
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Such accumulation would sequester more amino acids, would increase transport out of the cell up to saturation, and would therefore increase the loss of cysteine to cystine in the blood
This triggers delayed gastric emptyingyour stomach processes food more slowlyand sends stronger satiety signals to your central nervous system
Council on Clinical Cardiology