Hormonal
Gastrointestinal adverse events (nausea, vomiting, diarrhea, dyspepsia) associated with tirzepatide contribute minimally (up to 3.1%) to total weight reduction, with weight loss occurring similarly in patients with and without these symptoms.
Do not expect nausea or vomiting to drive your weight loss. Clinical data shows that patients who experience no gastrointestinal side effects lose just as much weight as those who do. Focus on the hormonal mechanism of the drug rather than tolerating discomfort as a sign of efficacy.
Mediation analyses suggested that N/V/D and dyspepsia were associated with up to 3.1% of total weight reduction... Weight reduction with tirzepatide was similar among participants reporting no nausea, nausea alone, or any N/V/D.
Why this rating
Based on pooled Phase 3 trials (SURMOUNT-1 to -4) with large sample sizes, though the analysis is post hoc and not controlled for multiplicity.
Source
Gastrointestinal tolerability and weight reduction associated with tirzepatide in adults with obesity or overweight with and without type 2 diabetes in the <scp>SURMOUNT</scp> ‐1 to ‐4 trials
Domenica Rubino et al. · Diabetes Obesity and Metabolism · 2025
DOI 10.1111/dom.16176
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