Police were called to Algorithme Pharma, at 575 Armand Boul., at around 11 a.m. after the person who received the package started feeling ill.
By the time police were on the scene, a second woman also started feeling the same symptoms, which were described as slight breathing problems. That's when police decided to evacuate the entire building.
Nineteen people were in contact with the suspicious package.
Firefighters provided chemical baths for about a quarter of those people.
Two people were taken to hospital and are now feeling better. The pharmacy remains closed.
Police and firefighters will be retrieving and testing the package for toxic chemicals.