Computer outage affecting Shoppers Drug Mart locations across country

Shoppers Drug Mart says a computer outage affecting all of its 1,300-plus locations is preventing customers paying with their debit cards and using their loyalty points program.

The national pharmacy retail chain, owned by Loblaw Companies Ltd. (TSX:L), says it started experiencing "intermittent" technical difficulties at all of its stores Monday night.

It says it can still accept cash and credit card payments of up to $300 and that all Shoppers Optimum points from transactions will be added to customers' accounts after the outage is resolved.

The company says it will provide an update later Wednesday.

The outage has prompted customers to go voice their complaints on Twitter.

Some say they haven't been able to refill their drug prescriptions and others say Shoppers needs to do a better job of communicating with its customers.