glp-1 drugs available in usa Drug Savings: A Complete Guide for How to Save on Ozempic, Wegovy, and More As GLP-1 Use Expands, Long-Term
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That is completely normal and expected

Diabetes Care 33:730732 Migoya EM, Bergeron R, Miller JL et al (2010) Dipeptidyl peptidase-4 inhibitors administered in combination with metformin result in an additive increase in the plasma concentration of active GLP-1

doi: 10.1016/j.lfs.2020.117531

All three are also indicated for diabetes under different names and dosing schedules, which can be confusing (see the table GLP Agonists for Obesity)

In some of the studies, an additional 10% dose reduction was done with drug escalation
OX, oxytocin
