They're primarily responsible for two big jobs. The first is to collect and process the initial adverse reaction report from their local area. Second is to promote and encourage reporting in the area.
A third one is perhaps encouraging appropriate use of adverse reaction information, because people tend to abuse it, for example the media, which tends to sensationalize it and scare Canadians away from using products that may actually be beneficial to them. There may be an issue with the subpopulation, etc., but they don't adequately explain it and put things into context.
So they have a huge job in working with their local constituencies to submit those reports to the national database.