In a Chicago Tribune investigation, reporters visited popular chain pharmacies with two prescriptions in hand. Taken together, the two drugs are highly dangerous and potentially deadly. Forty-nine percent of the time, the pharmacist handed over both prescriptions with no warning about the potential harm.

Tens of thousands of people are hospitalized every year in the U.S. from taking dangerous drug combinations. These illnesses aren’t helped by pharmacies that fail to issue warnings. The worst chain pharmacy offender, CVS, neglected to warn 63 percent of the time, while independent pharmacies failed 72 percent of the time.