Health Canada is informing Canadians that packages of certain lots of Marvelon 28 do not include day-of-the-week stickers. The stickers are meant to be applied on the blister pack containing the pills. The stickers indicate the first day of the week when the medication is started, and the weekdays that the pills should be taken. The stickers may be used by women to help them remember if they took their daily pill on a given day. Without these stickers, there may be an increased chance of missing a dose.