An electronic memory device in which a user can customize the keys on a keypad, record the occurrence of and information related to an unscheduled medical event or a scheduled medical event, for example, the taking of medication, and set a predetermined time interval between scheduled medical events. The keys are customizable so that the user can identify specific medications or specific symptoms. The device can be in the form of a personal digital assistant-based memory pad having icon keys so that the user can easily enter data, and an electronic pen for activating the on-screen icon keys.