The invention relates to a method and system that utilizes one or more containers (e.g., cassettes or trays), which hold one or more types of medicaments, the containers being configured for automatic and accurate dispensing of the medicaments. In one embodiment, a container for dispensing medicaments includes: a housing; a chamber within the housing to store the medicament units; an outlet defined in the housing to dispense the medicament units; and a movable medium within the housing and defining at least one compartment (e.g., radial groove) configured to hold and carry at least one medicament unit from the chamber to the outlet.