Provided herein are methods and dose packs for the monitoring of medication adherence. In one aspect, the dose pack comprises comprise a multiplicity of doses of an agent and a multiplicity of doses of a marker and be configured to isolate a pair of at least one of the multiplicity of doses of the agent and at least one of the multiplicity of doses of the marker for co-administration of the pair to the subject according to the dosing schedule. In another aspect, the method comprises obtaining a sample from the subject subsequent to the conclusion of a monitoring window and analyzing the sample for the presence or absence of a marker or a degradation product thereof.