In 2013, Anthony Gonzales was injured in a car wreck. He was prescribed cyclobenzaprine, a muscle relaxant, for pain. In 2014, Mr. Gonzales had his prescription filled at Walgreens. According to his lawsuit, the pharmacist instead gave him Xanax, which belonged to another man with the same name. Xanax is used to treat anxiety and panic disorders. It has been linked to suicidal tendencies in some individuals.