Six years after COVID-19 first made headlines, an antiviral pill has finally been shown to stop users from developing the disease after being exposed to the virus. The drug, called ensitrelvir, was originally approved for use in Japan as a treatment for COVID-19 , and it has now been approved as a preventative treatment, too. Now, promising late-stage trial results have been published as regulators in the U.S. and Europe consider whether to follow suit, Nature reported . Now, ensitrelvir, developed by Japanese pharmaceutical company Shionogi, has been shown to significantly reduce the risk of developing the disease, according to research published Wednesday (May 13) in The New England Journal of Medicine . The trial specifically focused on exposures from household contacts, a common source of SARS-CoV-2 spread . So if your roommate got sick, you could take ensitrelvir in addition to distancing yourself from them at home.…