A wireless tag apparatus and related medication compliance monitoring techniques are disclosed. In some embodiments, the apparatus may include a motion detector configured to detect at least one of a movement of and an impact to the apparatus. The apparatus also may include a sensing circuit configured to scan, in response to the detection by the motion detector, a sensor array associated with a medication dispenser external to the apparatus to determine whether contents of at least one medication compartment of the medication dispenser have been expelled. The apparatus further may include a transmitter configured to transmit, in response to the detection by the motion detector, a signal including data pertaining to whether the contents of the at least one medication compartment have been expelled, wherein the signal is a radio frequency signal. In some embodiments, the apparatus may be configured for use, for example, in monitoring medication compliance.