an electrically powered iontophoretic delivery device is provided . the device includes a pair of electrode assemblies and a source of electrical power connected thereto . circuitry is provided including an activation circuit and a power generating circuit . before use , neither the power generating circuit nor the activation circuit draw current from the power source . when the device is placed on the body and electrical contact is established between the two electrode assemblies , the activation circuit is closed causing the power generating circuit to be activated , thereby activating the device . the circuitry improves the shelf - life of the device by minimizing current drain from the battery before use .