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Dulaglutide is a similar medication to semaglutide and is in the same group of medications - a GLP-1 agonist

doi: 10.1016/j.jacbts.2018.09.004 44 DunganKDeSantisA

Short-acting RAs, such as exenatide (Byetta), lixisenatide and beinaglutide, have a duration of action of only a few hours after being subcutaneously injected., thus need multiple times injection daily

Metformin does not interfere with how your body absorbs or processes semaglutide, and semaglutide does not alter metformin's effectiveness or safety profile

Yang et al., 2020

Retatrutide and CJC-1295 + ipamorelin work through completely different receptor systems