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Huang, W

Prokinetic agents like erythromycin can counteract the gastric-slowing effects of GLP-1 drugs, impacting both gastric emptying and glycemic control

It's not super restrictive

Efficacy and Safety of the Once-Daily GLP-1 Receptor Agonist Lixisenatide in Monotherapy: A randomized, double-blind, placebo-controlled trial in patients with type 2 diabetes (GetGoal-Mono) Diabetes Care
Treatments with any of the multi-agonists significantly reduced body weight from 24- to 72-h relative to control PWA animals, while GLP1 decreased body weight only from 24- to 48-h

Another approach is a comprehensive weight loss panel to evaluate levels of thyroid hormones, insulin resistance and general health markers
