Acute and subchronic toxicity of multicomponent antiparasitic drugs Insaсar Total C Plus, Insaсar Total K Plus

Abstract

The purpose of the research is to study acute oral toxicity in mice, and acute dermal and subchronic toxicity in rats of multicomponent antiparasitic Insacar Total C Plus (for dogs) and Insacar Total K Plus (for cats).Materials and methods. The toxicity of the drugs was studied in September-April 2020–2021 at the premises of the VNIIP – FSC VIEV Vivarium. To determine acute oral toxicity, 80 outbred mice weighing 20 g were used, of which 7 test and one control group were formed. The drugs were administered once in a 1 : 3 dilution with polyethylene glycol as a solution through an intragastric tube and an automatic controller. The control animals were intact. After a single administration, the physical condition of the test mice was monitored within 14 days; weight gain, expected clinical toxicity symptoms and possible death were assessed. Before and on days 1, 3, 7, 11 and 14 of the experiment, the test and control mice’s weight gain were evaluated. The toxicity parameters were calculated by the methods of Pershin, Miller and Taintner. In a subchronic experiment, the study drugs were tested on 80 outbred white rats divided into 6 test and 2 control groups. The rats’ coat was also shaved on the back. The solution was applied to the shaved skin area once a day for 7 days at doses of 1,000 mg/kg (0.1 mL/100 g), 500 mg/kg (0.05 mL/100 g) and 200 mg/kg (0.02 mL/100 g) of the animal weight. On day 8 of the experiment, 5 rats from each group were euthanized; their blood samples were taken, and the internal organs were examined. On day 21 of the experiment, the second part of the animals was euthanized to analyze the reversibility of potential pathoanatomical changes after prolonged repeated application of the drug. The results were processed statistically.Results and discussion.The half-lethal dose (LD 50) after oral administration of the drug for dogs to the mice was 2,475 by the Pershin method, and 2,500±388 mg/kg by the Miller and Taintner method. LD50 of the drug for cats when administered into the mice’s stomach was 2,713 by the Pershin method, and 2,650±403 mg/kg by the Miller and Taintner method (hazard class 3). LD 50 when applied to the rats’ skin was more than 10,000 mg/kg (hazard class 4). When applied once to the rats’ skin, the drugs had a slightly irritating effect. In subchronic experiment on the rats with daily drug application on their skin at doses of 1,000 mg/kg, 500 and 200 mg/kg, no negative effects on the general condition or death of the animals were observed during the entire study. Hematological and biochemical parameters of the test rats that were treated with the drug for dogs at a dose of 200 mg/kg, an increased content of lymphocytes up to 83.40% was observed on day 8 of the experiment, and up to 74.20 % in the control; and an increased glucose level up to 6.08±1.23 mmol/L, and up to 4.82±0.70 mmol/L in the control; LDH was up to 766.00±264.19 U/L, and up to 434.80±525.89 U/L in the control.