we dont' have a Walgreens here in Canada but i bought mine in the states, at walgreens
i had to look hard for it tho.. not all had it, but next time i come across it i'm going to get another one just so i know ihav emore for backup. i think Layla is going to be a girl with allergies.. i can't wait for winter (woah never thoughd i'd say thaT!!) when the allergies will be gone. It just knocks her out so it will be great for your car ride!!!