How long does it take for Ritonavir to work? Home › Forums › Cancer › How long does it take for Ritonavir to work? Tagged: Paxlovid price, Paxlovid tablet price, Ritonavir 100mg This topic has 0 replies, 1 voice, and was last updated 1 year, 11 months ago by magicinepharma1. You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In