In the system of veterinary and sanitary measures, disinfection occupies one of the important places, contributing to ensuring the welfare of animal husbandry against infectious diseases, increasing the productivity of animals, poultry and the sanitary quality of products, raw materials and animal feed. The main purpose of disinfection is to break the epizootic chain by influencing its most important link - the factor of transmission of the causative agent of the disease from the source of infection to the susceptible organism. Based on the foregoing, we were assigned the goal of studying the characteristics of the new domestic disinfectant AQUAdez-NUK 5, and to achieve this goal, one of the tasks was to study acute toxicity. In order to study the acute toxicity of AQUAdes-NUK 5 when administered orally, experiments were carried out on male Wister white rats weighing 220-230 g. at doses of 2000, 3000, 4000 and 5500 mg / kg. For the experiments, the rats were divided into groups of 10 animals. 10 animals were used to study each dosage for each disinfectant. One group of ten animals served as a control, which was injected with 0.9% sodium chloride solution. The disinfectant was injected in pure form. After administration, the laboratory animals were monitored for two weeks. The experiment took into account the death of animals and the clinical picture of intoxication. In the course of laboratory studies, we determined that AQUAdez-NUK 5 belongs to the III hazard class in accordance with GOST 12.1.007-76 (moderately hazardous compounds), as well as the presence of a weak irritant effect, and therefore we took appropriate safety measures during work with this disinfectant.