. >> reporter: what does it feel to haveour fut on right now peences andmighnot hap a cbs ne found dozens of drugs critical for fighting the coronavirus remain in short supply.obms in chain, and the effect is now spilling over into antibiotics and common prescription drugs. anna werner has the details. >> not being able to breathe is the most stressful thing in the world. >> reporter: meet 18-year-old ava valdez. she's a student who needs an inhaler for allergy-induced asthma. >> and allergy pills, and this contraption. >> reporter: but due to covid-19, supplies of inhalers are running short, so she's rationing her use. >> i have to wake up every morning and then say, okay, can i use this thing that i desperately need and that will provide me immediate r reallyth that. rep aea ct galaxy owe ram increase demand. but a list put together by the resilient supply project by the university of minnesota shows 40 drugs deemed critical for treatment of covid-19 patients, 32 -- 80% -- are in short supply. u of m professor. >> we call paralytics what they use when they put you on a ventilator. some