[Chronic urticaria. Treatment with ketotifen].

Ketotifen inhibits the Ca++ pass through the mastocyte and basophil membrane. So inhibit histamine and S. R. S. A. liberation. Results in the treatment with Ketotifen of 36 cases of chronic Urticaria are exposed. Patients between ten and fifty years old, and with symptoms chronicity during from two until ten years, were studied. Chronic cases of unknown etiology, cholinergic urticaria, salicylates urticaria, urticaria by pressure, local heat urticaria and chronic dermographism were treated. Results were hopeful. Especially in patients with cholinergic urticaria, urticaria by heat, salicylates urticaria and strong idiopathic dermographism.