The Danish drugmaker Novo Nordisk contends that semaglutide, the active ingredient in Ozempic and Wegovy, is too complex for those manufacturers to make safely.

Novo Nordisk wants the Food and Drug Administration (FDA) to prevent compounding pharmacies from manufacturing their own versions of the company’s popular weight loss drug Wegovy and diabetes treatment Ozempic,

Novo Nordisk on Tuesday asked the U.S. Food and Drug Administration to ban compounding pharmacies from making copycat versions of its popular weight-loss and diabetes drugs, which it said were too complex for those manufacturers to produce safely.

This week, Novo Nordisk, the Copenhagen, Denmark based pharmaceutical company, asked the US Food and Drug Administration (FDA) to add semaglutide to the agency’s Demonstrable Difficulties for Compounding (DDC) lists.

Ozempic maker Novo Nordisk (NVO) is asking the U.S. Food and Drug Administration (FDA) to prohibit compounding pharmacies from making off-brand versions of semaglutide, the active ingredient in its blockbuster weight loss and diabetes medications.

The agency posted documents this week that the drugmaker had requested the drug be placed on the FDA's "Demonstrable Difficulties for Compounding Lists."

Novo Nordisk is pushing the FDA to block compounders from making copies of its Ozempic and Wegovy, saying the weight-loss treatments are too complex to safely replicate. Why it matters: It's the latest twist in the battle between pharma giants and compounders over the law that allows copies of patent-protected drugs amid shortages.