Arimidex is a prescription medication containing 1mg of anastrozole per tablet, supplied in a pack of 28 tablets. Each tablet is clearly marked with the days of the week to help track dosing. The medication comes in blister packs with tablets arranged by days of the week (Monday through Sunday) to help patients maintain their prescribed dosing schedule. The package contains 28 tablets total, providing a 4-week supply when taken as directed.