Waterloo Regional Police are looking for a man who tried to rob a pharmacy at gunpoint on Monday evening.

According to police, the suspect entered Guardian Pharmacy on 1401 River Rd E shortly after 6 pm and waited for all the customers to leave.

He then started demanding money and narcotics from employees and pulled out a sawed-off shotgun before entering the dispensary of the store.

Police say he made several demands and got very aggressive before running away on foot without getting anything.

He's described as a heavily tanned white male between 30 to 40 years old, 6 feet tall (183 cm) and with a thin build. Police are asking anyone with information to contact police or Crime Stoppers.