The inventive transdermal therapeutic systems (TTS) incorporate a timing device, such as an electronic timing device, particularly a thin, electronic timing device. The timing device can be a part of, adhered to, or used in lieu of the TTS backing layer. The device generally includes a pre-programmed or pre-designated timer, an activation and/or reset button to start or reset the timer and an indicator, such as a visual indicator, to alert the patient when the administration time period has lapsed.
