London Drugs allows coupons stacking. This means that you can use more than one coupon on an item. There are restrictions though.

• Expiry date has not been exceeded
• Is redeemable in Canada(has a Canadian Clearing House mailing address)
• The product named on the coupon has been purchased
• The size and/or flavour of the item, as stated on the coupon, have been purchased
• The required number of items has been purchase
• Only one coupon per purchase. This means only one of this exact type of coupons can be used. (multiple coupons can be used as long as they are all different) 

When using multiple coupons, please remember that the coupons have to be different. Basically, the UPC code on it must be different.

Here's an example of 2 coupons you can use for one product - they are essentially the same coupon, but because the code is different, they are accepted.




















And here's an example of 2 you CAN'T use together. Note that the expiry date is different, but the barcodes aren't.




















If you can questions, comment below :)