Aspects of the invention include systems for monitoring compliance of a patient with a patch dosage regimen and, where necessary, providing rapid, economical intervention when non-compliance is detected. In some instances, the systems include: a patch comprising an active agent and a patch tag; a reader configured to detect the patch tag; one or more processing devices; and a compliance determination module comprising a computer-readable storage medium comprising instructions that, when executed by the one or more processing devices, determine compliance information from data received from the reader. The compliance information includes data that may be employed to determine whether the patient is complying with the patch dosage regimen. Also provided methods of using the systems, e.g., to monitor patient compliance, as well as components of the systems, e.g., patches, readers, etc.