The pharmaceutical company's MariTide treatment performed well in a Phase 2 study but not as well as Wall Street expected.

The pharmaceutical manufacturer Amgen announced on Tuesday that an experimental obesity drug helped patients lose up to 20 percent of their weight in a year. The drug, MariTide, is given by injection once a month, compared with once a week for other obesity drugs like Wegovy and Zepbound that are already on the market.

Shares of Amgen (NASDAQ: AMGN) recently ticked lower despite a very positive-sounding press release regarding its weight management candidate. According to the giant drugmaker, treatment with an anti-obesity candidate called MariTide helped patients reduce their weight by up to 20% after 52 weeks.