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How Tirzepatide Works Tirzepatide is the first medication that targets two hormones instead of one: GLP-1 and GIP (glucose-dependent insulinotropic polypeptide)
Compound Receptors Peak trial weight loss Lean mass as share of loss Semaglutide (Ozempic/Wegovy) GLP-1 ~14.9% (STEP-1, 68 wk) ~39% Tirzepatide (Mounjaro/Zepbound) GLP-1 + GIP ~20.9% (SURMOUNT-1, 72 wk) ~25-40% Retatrutide GLP-1 + GIP + GCGR ~24.2% (Phase 2, 48 wk) Comparable class range Best for understanding the takeaway: the percentage of loss that is lean mass is roughly constant across the class
Because of that, stomach-related side effects tend to occur, particularly in the first few weeks
Authorities seized fake drugs, raw materials, and production machinery
Contraindications and precautions Medical contraindications: Personal or family history of medullary thyroid carcinoma or multiple endocrine neoplasia syndrome type 2 contraindicate GLP-1 receptor agonist use