Quick Answer: Tirzepatide safety during breastfeeding is unknown, as no human data exist on its transfer into breast milk or effects on nursing infants
Anabolic/Androgenic Steroids (e.g., testosterone, nandrolone, turinabol) Protein and Peptide Hormones (e.g., hGH, GHRP, BPC 157) Anti-estrogenic Agents (e.g., tamoxifen) Selective Androgen Receptor Modulators (SARMS) (e.g., Ostarine) Diuretics (e.g., chlorothiazide) Stimulants (e.g., amphetamines, Ritalin, ephedrine) Gene Doping (e.g., GW1516) Here is a full list of banned substances
Cell 118 , 635648 (2004)
Thats one more reason I encourage women to test rather than guess
Geroscience 47 , 44134427 (2025)
For some patients, this may lead to greater overall weight loss or improved response, particularly if progress has slowed on other medications