Data reported earlier Monday from Viking Therapeutics (NASDAQ:VKTX) on its weight loss medicine VK2735 indicates that Novo Nordisk (NVO) and Eli Lilly (NYSE:LLY), which currently dominate the obesity drug space,

Viking says an early-stage study of its obesity pill VK2735 showed adults on the highest dosage lost 8.2% of their body weight in four weeks.

Eli Lilly CEO David Ricks told investors this week that the sale of cheaper, knockoff versions of the company’s blockbuster weight loss drug Zepbound was not dragging down sales. Pfizer sales rose 31% to $17.