The present invention provides a pediculicidal and ovicidal composition with an extraordinarily lethal effectiveness that can also be used to remove parasites, such as lice. The pediculicidal and ovicidal composition contains a purified terpene agent such as citronellal, citronellol, citronellyl or a mixture thereof, a short chain alcohol, and a non-aqueous co-solvent and/or surfactant component. The composition more preferably utilizes citronellyl acetate as the active agent. The compositions can be administered topically to humans, animals or any infested areas.