. >> 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 drugs as common as acetaminophen the active ingredient in tylenol. >> reporter: demand for three classes of drugs for patients on ventilators was 87% higher in april than in january. and just 57% of orders placed by its member hospitals could be filled. and i j drugs vid-19atnt. shondameyer tracks shortages of

. >> reporter: meet 18-year-old ava valdez.he's a student who needs an inhaler for allergy-induced asthma. >> an allergy pill, and this contraption. >> reporter: due to covid-19, supplies of albuterol inhalers are running shorts so she's rationing her use. >> to have to wake up every morning and say, okay, can i use this thing that i desperately need and that will provide me immediate relief is really frustrating to not know whether or not i can have that. >> reporter: at least one inhaler manufacturer, glaxosmithkline, says it has ramped up production of inhalers to meet increased demand. a list put together by the resilient drug supply project of the university of minnesota shows of 40 drugs deemed critical for treatment of covid-19 patients, 32, 80%, are in short supply. you of m professor stephen schondelmeyer. >> there's a lot more drugs that are what we call paralittics that they might use when they put you on a ventilator. then some drugs as plain and common as acetaminophen, the active ingredient in tylenol -- >> report