inhalation administration of medication /in′həlā″shən/ [L, in, within, halare, to breathe] , the administration of a drug by inspiration of the vapor released from a fragile ampule packed in a fine mesh that is crushed for immediate administration. Amyl nitrate and ammonia act quickly and are often used in this way. The medication is absorbed into the circulation through the mucous membrane of the nasal passages. Vaporized medication is also given by inhalation. See also inhalation therapy, respiratory therapy.
