is phentermine a glp 1 receptor agonist Understanding Weight Loss Medications: GLP-1 vs. Do You Have to Stay
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Also, it has not yet been studied in patients with history of pancreatitis, an issue with other GLP-1 agonists

They are approved for adults and pediatric patients aged 10 years and older

Liraglutide and a lipidized analog of prolactin-releasing peptide show neuroprotective effects in a mouse model of -amyloid pathology

J Am Pharm Assoc 46(1):44-52
This discrepancy in serum levels could be addressed to the fact that it is not always stated which form of SP (full length versus truncated) is measured