Semaglutide delays gastric emptying by 20-40%, which can: Prolong the time levothyroxine remains in the stomach Alter the pH environment during absorption Change the interaction between levothyroxine and food or other medications Practical Strategies to Minimize Interaction Based on clinical experience and pharmacokinetic principles, the following strategies help maintain stable levothyroxine levels: Take levothyroxine first thing in the morning on an empty stomach this remains the gold standard regardless of semaglutide use Wait at least 30-60 minutes before eating or taking other medications Consider taking levothyroxine at bedtime some patients find this avoids the gastric emptying overlap entirely (research supports comparable absorption with nighttime dosing) Monitor TSH every 6-8 weeks during the initial months of semaglutide therapy Report symptoms promptly fatigue, cold intolerance, constipation, or brain fog may indicate suboptimal thyroid levels When Dose Adjustments Are Needed Thyroid medication adjustments during semaglutide treatment may be necessary in two scenarios: TSH rising (under-replacement): May indicate impaired levothyroxine absorption
Make sure to get your screening tests regularly
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In the phase 3 ESSENCE RCT, which included MASH patients with fibrosis stage F2/F3, semaglutide significantly improved histological activity, fibrosis markers, and cardiometabolic features after 72 weeks of treatment in comparison to placebo [81]
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