GLP-1 receptor agonists — the class of medications that includes semaglutide (sold as Ozempic and Wegovy) and tirzepatide (Mounjaro, Zepbound) — have become one of the most searched health topics in America for two years running. In 2026, an estimated 15 million Americans are now prescribed these medications, up from 5 million in 2024.

How GLP-1 Drugs Actually Work

GLP-1 (glucagon-like peptide-1) is a hormone naturally produced in your gut after eating. It signals your brain that you’re full, slows gastric emptying, and helps regulate blood sugar. The medications mimic this hormone — but at much higher concentrations than your body produces naturally. The result for most patients is a significant reduction in appetite and, over time, substantial weight loss.

The Real Results: What Clinical Trials Show

• Average weight loss of 15–22% of body weight over 68–72 weeks
• Significant reductions in cardiovascular risk in patients with obesity and heart disease
• Improved blood sugar control (originally developed for Type 2 diabetes)
• Emerging evidence of benefits for liver disease and sleep apnea

“These medications are genuinely transformative for the right patient. But they are not magic — and they are not without meaningful side effects.” — Dr. Fatima Choudhary, Endocrinologist, Johns Hopkins

Common Side Effects to Know

Nausea, vomiting, diarrhea, and constipation are the most frequently reported side effects, especially during the first weeks of treatment. More seriously, a small percentage of patients experience pancreatitis, gallbladder disease, or — in very rare cases — a type of thyroid tumor. Patients with a personal or family history of certain thyroid cancers are advised to avoid these drugs.

The Cost Problem

Without insurance, these medications cost $900–$1,300 per month. Medicare now covers them for patients with obesity and at least one weight-related condition, but millions of Americans with private insurance or no insurance still face substantial out-of-pocket costs.

Questions to Ask Your Doctor

• Am I a good candidate given my medical history?
• Which medication and dosing schedule is right for me?
• What happens if I stop — will I regain the weight?
• How will this interact with my other medications?
• What lifestyle changes should I make alongside the medication?