IRCT2014072614229N2 IRCT 2014-09-05 Arak University of Medical Science Effect of Alcea Althea on latex allergy Comparative effect of Alcea Althea with placebo on severity of latex allergy symptoms among operating room staffs in hospitals of Arak city. 2014-03-20 anticipated 66 Complete https://irct.ir/trial/13867 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Other design features: Double-blind study. Participants and the researcher is not aware of the materials that used in the study. Subjects were randomly assigned into experimental and control groups by lottery. N/A latex allergy. Intervention 1: Group 1 (intervention): 5 ml of 8% aqueous extract solution of flowers and roots of Althea officinalis, are used for 30 days, before and after using gloves. Intervention 2: Group 2 (control): 5 ml of placebo (sterile water), before and after, is used for 30 days, before and after using gloves.