the present invention relates to the art of veterinary science . the preparation for prevention and treatment of myiases of animals comprises the following components , percent by mass : an insecticide exhibiting a larvicidal effect : 1 . 4 to 2 . 3 a 5 - 10 % ethanolic solution of polyvinylbutyral and a resol - type phenolformaldehyde resin taken in a ratio of 1 : 10 - 45 : 16 to 35 . 0 a plastifying agent improving elasticity of the resulting polymeric film : 1 . 0 to 20 . 0 an antibiotic : 0 . 1 to 0 . 7 an organic solvent : the balance .