Sanofi Rebuked in UK Over RSV Claims Targeting Rival Pfizer

A UK regulator reprimanded Sanofi for making misleading claims about its RSV shot and disparaging rival Pfizer Inc.’s vaccine.

The French drugmaker breached the industry’s own code of practice by making unsubstantiated claims that its RSV antibody shot Beyfortus was more effective than Pfizer’s maternity vaccine, the UK’s Prescription Medicines Code of Practice Authority said Monday, responding to a complaint from the US company.