A 16-year-old boy left the University Behavioral Center in Orlando at around 7:45 p.m. Friday and hasn't been seen since, the Orange County Sheriff's Office said.
Andrew Gerard Zidek was last seen wearing a red baseball cap, a black T-shirt with red lettering, red jeans and black tennis shoes. He is 5 feet 11 inches tall and weighs between 130 and 140 pounds. He has brown eyes and brown hair.
Deputies said prior to running away, Zidek made statements to his family that he wanted to harm himself.
Anyone with information is asked to call the sheriff's office at 407-836-4357.