Toxicity of Halogenated Oxyquinolines in Dogs. A Clinical Study

Abstract

LANNEK, BIRGITTA and PAUL LINDBERG: Toxicity of halogenated oxyquinolines in dogs. A clinical study. III. Intoxication experiments. Acta vet. scand. 1974, 15, 398–418. — Oxyquinoline drugs, which are normally well tolerated by dogs, will cause disease when a dog’s resistance is occasionally lowered. In a series of experiments in dogs we tried to reproduce the disease pattern of spontaneous cases of poisoning. Most of these experiments, using even high single or repeated oral doses, failed. It was observed, more or less by chance, that the intestinal absorption of ¹²⁵I-labelled vioform was greatly increased when the dog was not fasted. The consumption of fat, but not of protein or carbohydrates, was found to be the responsible factor. When the oxyquinoline drug was given in a fat emulsion, approx. 1/3 of the dogs fell ill. When fouled fish was also added, the dose necessary to produce disease was lowered to the range used in vioform therapy. We believe that phenolic substances, which may be produced from bacterial degradation of proteins in intestinal disorders, compete with oxyquinolines in metabolic and elimination processes. vioform; oxyquinolines; dogs; convulsions; heart injury; liver injury; poisoning; diarrhoea; phenolic substances.