SUMMARY
It has been experimentally proven that with the intraperitoneal way of introduction of Dezapur the maximum tolerated dose for mice is 2000 mg/kg, the least toxic dose – 1000 mg/kg, the median lethal dose – 3000 mg/kg. When the dose of 3500 mg/kg was introduced to rats one animal died; in the dose of 5000 mg/kg there was 100% death of animals, the median lethal dose was 4500 mg/kg of the animal’s weight. In intragastric introduction the maximum dose of Dezapur for mice was 6000 mg/ kg, for rats it was 11000 mg/kg; by the end of the observation period all animals were alive and alert. According to K.K.Sydorov classification the derivative with the code of KMS-211 (“Dezapur”) has been proven to belong to practically nontoxic substances (the VI class of toxicity).