Some commercially insured patients stand to save $150 per month on Wegovy, a popular obesity medication. Patients on Medicare and Medicaid are not eligible.

Coverage complications are not unusual in the U.S. health care system. But the challenge is magnified for these obesity treatments because a wide swath of the population could be eligible to take them, and patients have to stay on the drugs to keep the weight off.

After Zepbound-maker Eli Lilly reduced the price of the weight-loss drug, competitor Novo Nordisk has cut the price of weight-loss drug Wegovy.