OPP say that around 7:45pm, the suspect entered the pharmacy, displayed a handgun demanding pharmacy staff provide him with narcotics prior to fleeing the scene in a westerly direction.
A minimal amount of narcotics were reported to have been taken.
The suspect is described as an adult male, white, approximately 5 feet 8 inches tall, wearing a two tone grey jacket and blue jeans.
Any one with information is asked to call the Essex County OPP major crime unit at 519-723-2491.
Should you wish to remain anonymous, you can call Crime Stoppers at 1-800-222-8477 (TIPS) where you may be eligible to receive a cash reward of up to $2000.