Canada approved on Monday the nation’s first antiviral pill to be used at home to fight Covid-19 infections, although global supply shortages may impact how quickly the drug can be distributed to those who need it.

In December, Canada ordered one million treatment courses of Paxlovid, manufactured by Pfizer, and has received a shipment of more than 30,000 treatment courses, said Jean-Yves Duclos, minister of health. He said another 120,000 Paxlovid courses were expected to arrive in February and March.