Valoración de la variación del PC 20 en pacientes tratados con Zafirlukast / Evaluation of the variation of the PC 20 in patients treated with Zafirlukast

We study the use of zafirlukast in patients with broncial hyperactivity 30 patients during 5 months, non smokers and not receiving oral or inhaled steroids, teophiline, antihistaminics or long action B2 were studied. 15 patients used zafirlukast 10 mg twice a day during 5 months, and 15 patients did not use zafirlukast. Both groups did not change significatively their spirometries and the PC 20 in the Metacholyne test