From the Globe and Mail:
Rewards for drug purchases nixed
Ontario consumers can no longer collect Air Miles or other loyalty rewards for their prescription purchases -- a setback for pharmacies such as Pharma Plus and Shoppers Drug Mart that try to lure customers with these programs.

The Ontario Superior Court has upheld a recent decision of the Ontario College of Pharmacists to ban such rewards on the basis that they can be seen as an "inducement" to take prescriptions -- and as such are professionally unethical.