ISAMOXOLE is an effective anti-allergic compound in animals. It is a moderately potent, selective inhibitor of slow-reacting substance of anaphylaxis (SRS-A) activity. SRS-A is a group of leukotrienes (LTC4, LTD4, and LTE4) that is the major mediator of bronchoconstriction, hypersensitivity, and other allergic reactions.