A calendar blister pack marked with days of the week to aid adherence to correct dosage. The compliance of patients is shown to be improved and assisted with calendar packaging. Forgetfulness is a common factor in unintentional non-adherence to the correct dosage, especially with those elderly patients or others with memory problems. In order to overcome this problem a patient has marked a blister pack but this might still lead to errors in dosage if a mistake is made in labelling.