Police have found the man who escaped from a Brisbane psychiatric hospital in Victoria.

Police put out warnings yesterday that Justin Grant, 29, could be dangerous and should not be approached.

Mr Grant is understood to have gone missing from the high-security Park Hospital in Wacol on Friday morning, after he left the premises without his prescribed medication.

Police said they found Mr Grant in Rosebud, south of Melbourne just before midday.

He was apprehended without incident.

Queensland Health said Mr Grant, who has been having treatment since 2009 under a mental health court order, may be dangerous without daily medication.

The director of forensic mental health services, Ed Heffernan, said Mr Grant was allowed his first unsupervised leave to visit a canteen in the hospital grounds on Friday. He was expected to report back about 1.30pm, but he did not return.

- with AAP