Naphthalenum, Naphthalene. Used internally in 2 gr. doses as an intestinal antiseptic, and in I5 gr. doses, followed by castor oil, as an anthelmintic. In my judgment, bismuth beta-naphtholate or salol are superior to it for internal administration. Its safety in anthelmintic doses is certainly open to question, and it should not be given to children, although small doses (IX to 2X) are asserted to be of value in whooping cough. A 5% ointment is used in parasitic skin diseases.