Can you combine Paxlovid with other COVID-19 drugs? FDA says no, for some

Taking Pfizer's blockbuster COVID-19 pills, Paxlovid, at the same time as a rival's treatment for the virus might be safe and more effective than either drug alone, federal scientists have found. 

The combination might also offer a solution to so-called "rebound" cases, when patients see a return of symptoms after finishing off a course of Paxlovid. 

But more research is needed, and the Food and Drug Administration does not currently allow doctors to prescribe both drugs to a patient.