Shares were down 4.3% at 1330 GMT, the lowest since August 8, after the company announced headline results from its trial of monlunabant, an experimental drug it acquired as part of its $1 billion purchase of Canadian biotech company Inversago Pharmaceuticals last year.

Novo Nordisk's shares fell nearly 5% on Friday after results from a Phase 2a trial of the Danish drugmaker's experimental obesity pill monlunabant came in below market expectations.

Novo Nordisk's U.S.-listed shares lost ground Friday after a study of the pharmaceutical firm’s latest obesity treatment showed less effectiveness in higher doses.

Novo Nordisk, tje manufacturer behind Ozempic and Wegovy has another weight loss medication in the works — but according to its trial results, it has some pretty freaky side effects. As Fierce Biotech reports,