Effervescent pharmaceutical compositions containing a high amount of N-acetylcysteine and a method of treating acetaminophen poisoning with effervescent pharmaceutical compositions containing a high amount of N-acetylcysteine are described. The low flux gives the particles in this stream a chance to interact and thus form an irregular matrix that itself helps to trap particles. The high voltage generating circuit generates a voltage in response to an internal sleep signal. The flange may extend laterally and longitudinally from the body to substantially preclude transverse access to the terminal from the front side of the electrical fixture.