Halifax police are looking for a 21-year-old patient who went missing from the East Coast Forensic Hospital.
The hospital said Maxim Baril-Blouin left his supervisor without permission.
"His risk to himself and others increases with time away from care," read a release.
Hospital authorities said he also has a physical health condition that puts him at risk if he doesn't take his medication.
Baril-Blouin might be out of province and has contacts in Whitehorse.
He has green eyes and short blond and brown hair. He has scars on his chest and back and a tattoo of a cross on his left upper arm.
Vladimir Trubman, another patient who had been missing for more than a month, was found four days ago.