This document discusses ways to reduce unused pharmaceuticals entering the environment. It argues that usage control through prudent healthcare practices that minimize unnecessary prescribing and dispensing can significantly reduce pharmaceutical residues more than disposal practices alone. Usage control can eliminate the need for disposal and also reduce residues released through excretion and bathing. The document also notes several collateral benefits to pollution prevention and usage control, such as reduced healthcare costs, improved treatment outcomes, and fewer poisonings from unused drugs.