FIELD : medicine; pharmaceuticals.SUBSTANCE : group of inventions refers to pharmacy, particularly to antiparasitic oral compositions for treating animals. Composition contains a combination consisting of an essential oil containing gamma-terpene, corvacrol and thymol selected from the genus Origanum and the genus Thymus, and an essential oil selected from the genus Cinnamomum and Eugenia, or essential oil of the genus Cinnamomum and essential oil of the genus Eugenia. Also disclosed is an anti-parasitic oral composition comprising a saponin source and a combination consisting of an essential oil containing gamma-terpene, corvacrol and thymol selected from the genus Origanum and the genus Thymus, and an essential oil selected from the genus Cinnamomum and Eugenia, or an essential oil of the genus Cinnamomum and essential oil of the genus Eugenia. Also disclosed is a method of producing said composition, involving mixing all ingredients together.EFFECT : group of inventions provides preparing compositions which are effective for reducing parasitic infection in animals.15 cl, 5 dwg, 2 tbl, 3 ex