Methods and apparatus monitor medication usage data for one patient or a population of patients, which can be processed to determine compliance patterns. Such methods and systems can associate, analyze, organize and present medication usage data, compliance patterns, and correlations between compliance patterns and outcomes data for electronic analysis or analysis by a caretaker. Such methods and apparatus permit analysis of compliance patterns to enable, for example, establishment or adjustment of safe and effective treatment regimens, and may include feedback systems for ensuring authenticity of medication and/or effects of medication on a patient. Such methods and apparatus also permit detection of medication in a biological sample of the patient through a medication monitor having a detection device, such as a skin-prick device, and a glucose sensor that can detect a target agent in the biological sample.