Leave a pharmacy bag on the passenger seat while you run into the store, and on a hot day you may be cooking your prescriptions. The inside of a parked car can climb past 120 degrees Fahrenheit, or 49 Celsius, within minutes in summer, even when it is not brutally hot outside, and that kind of heat can change the chemistry of certain drugs so they no longer work the way they should. The Spanish-language outlet El Diario laid out which medications are most at risk, drawing on guidance from the U.S. Food and Drug Administration and the American Diabetes Association.