Diethyl phthalate is an orally active plasticizer and detergent base. Diethyl phthalate increases the activities of ACP, ALP, SDH, and ALT in liver, muscle, or both tissues. Diethyl phthalate induces dose-dependent mortality and sluggish behavior in freshwater fish. Diethyl phthalate may induce male reproductive toxicity. Diethyl phthalate is added to plastic polymers to help maintain their flexibility[1][2].