Semaglutide slows gastric emptying; levothyroxine requires rapid absorption for efficacy. Delayed absorption may reduce levothyroxine effectiveness (symptom: hypothyroid fatigue returns). Mitigation: take levothyroxine 30+ minutes before semaglutide, or separate by 4+ hours. Monitor TSH; levothyroxine dose may need increase.

Does Semaglutide Interact With Levothyroxine?

Semaglutide slows gastric emptying; levothyroxine requires rapid absorption for efficacy. Delayed absorption may reduce levothyroxine effectiveness (symptom: hypothyroid fatigue returns). Mitigation: take levothyroxine 30+ minutes before semaglutide, or separate by 4+ hours. Monitor TSH; levothyroxine dose may need increase.

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