Study of acute toxicity of the drug «Kolidev 8M» with a single intragastric injection in laboratory animals
Authors: Sachuk Roman , Stravskyy Yaroslav , Gutyj Bogdan , Velesyk Tetiana , Katsaraba Orest , Zhyhaliuk Sergii 
Published: July 2021

«Kolidev 8M» (powder for oral use) is a veterinary drug used to treat ornamental birds (pheasants, peacocks) in diseases of the digestive tract caused by microorganisms sensitive to colistin.
In the study of the drug «Kolidev 8M» for oral administration, along with the confirmation of therapeutic properties, it is necessary to determine the LD50 obtained in the process of studying acute toxicity.
The aim of research. The aim of research was to determine the acute toxicity of the veterinary drug «Kolidev 8M» (powder for oral administration) under the conditions of intragastric administration to white mice.
Materials and methods of research. To achieve this aim, an experiment was conducted on 114 males of nonlinear white mice kept under optimal conditions in the vivarium of DEVIE LLC (Rivne, Ukraine). In the first series of experiments on the principle of analogues was formed control and three experimental groups of 6 animals each (n=6). The drug in the form of a solution was administered once orally using a esophageal gastric tube in doses of 500,0; 2000,0 and 4000,0 mg/kg body weight by absolute weight of the drug. The animals of the control group were injected with distilled water.
After taking into account the results of the first experiment in the next experiment, 6 experimental groups were formed – mice, which were administered the drug «Kolidev 8M» in the form of a solution in doses (by absolute weight of the drug) – 500,0; 1000,0; 1500,0; 2000.0; 2500,0; 3000,0; 3500 and 4000,0 mg/kg body weight, as well as the control group – animals that were injected with distilled water with a volume of 0.5 cm3 according to similar regulations (Zapadniuk, 1983; Kotsiumbas, 2005; Karkyshchenko & Hrachev, 2010). There were 6 animals in each group (n=6). After their death, a pathological autopsy was performed (Zharov A. et al., 2003).
The average lethal dose of LD50 was calculated by the method of probit analysis by Prozorovsky V.B.
Research results. According to the results of research, it was found that the LD50 of the drug «Kolidev 8M» (powder for oral administration) under the conditions of its single intragastric administration to male mice is 2024,72±232,45 mg/kg, LD10 – 392,87 mg/kg, LD16 – 751,56 mg/kg, LD84 – 3297,88 mg/kg, LD90 – 3656,57 mg/kg, LD100 – 3934,47 mg/kg body weight, respectively.
According to the results of an acute toxicological experiment with intragastric administration of the drug «Kolidev 8M» to white male mice, LD50 was 2024,72±232,45 mg/kg body weight. This allows, according to toxicity, to refer this drug to class IV – low-toxic substances (LD50 501,0-5000,0 mg/kg body weight), and the degree of danger to class III – moderately safe substances (LD50 151,0-5000,0 mg/kg body weight).
Conclusions and prospects for further research. The drug «Kolidev 8M» in terms of toxicity belongs to class IV – low-toxic substances, and the degree of danger to class III – moderately safe substances.
Further studies will be the next stage of pre-registration trials aimed at studying the subacute toxicity of the drug «Kolidev 8M»