Klobusitzsky haemocoagulase, a haemostatic drug obtained from snake poison, was administered prior to surgery in 35 cases of harelin, cleft palate, hypospadias and deviation of the nasal septum. Treatment was carried out from 2 to 6 days, doses and i.m. or i.v. administration being determined on the basis of age. Objective and subjective results were good, particularly in cases of cleft palate and septum deviation. In all cases, there was a significant shortening of bleeding time after treatment with the drug.