Common GLP-1 side effects: nausea (20-44%), vomiting, diarrhea, constipation. Serious risks: pancreatitis, thyroid C-cell tumors (boxed warning), gallbladder issues. Tirzepatide and semaglutide have similar profiles. Management: slow dose titration, small frequent meals. Safety info | Talk to a doctor. Sources: FDA, Endocrine Society