Multiple clinical studies have documented no significant drug-drug interactions between metformin and semaglutide, tirzepatide, or other GLP-1 agonists
The 2-OH-E1 route catalyzed by CYP1A1 is a stable route, and it can be easily metabolized further through methylation, which is accomplished by catechol-O-methyltransferase (COMT)
Prog Clin Biol Res 321:383402 Ruzicka L, Bradford YM, Frazer K, Howe DG, Paddock H, Ramachandran S, Singer A, Toro S, Van Slyke CE, Eagle AE, Fashena D, Kalita P, Knight J, Mani P, Martin R, Moxon SAT, Pich C, Schaper K, Shao X, Westerfield M (2015) Zfin, the zebrafish model organism database: Updates and new directions
however, these benefits were limited only to obese patients (99)
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The peptide itself does not induce muscle loss