In her [Jessica Baty] second conversation with CNN, on Tuesday, Baty said [Steven] Kazmierczak began seeing the psychiatrist shortly after they transferred from NIU to the University of Illinois in Champaign in June 2007.
A psychiatrist not familiar with the details of the case said the three-drug combination was not necessarily either unusual or dangerous.
"It's not terribly unusual to prescribe all three," said Dr. Nada Stotland, professor of psychiatry at Rush Medical College in Chicago and president-elect of the American Psychiatric Association.
Xanax typically has a sedating, calming effect on users, she said.
"If you take a lot of that class of medication, you can be sort of like somebody who is drunk, out of it, but not violent," she said.
A person who had stopped taking it might feel anxious and edgy, she said.
And Ambien is commonly prescribed to overcome sleeping difficulties sometimes attributed to Prozac, she said.
Baty also said that Kazmierczak had been on the computer recently, but she did not know what he was doing and did not ask.
"He was being secretive with his computer," Baty said. "When he would sit on the couch with his laptop he would turn it away from me so I couldn't see what he was looking at."