The invention is developed to be used in veterinary medicine, biology and medicine, it can be used against nematodes of domestic and wild animals, and of humans. In particular, the invention consists in use of solution of formic acid in 1% concentration as a nematodicidal preparation for elimination of different stages of Nematoda elminths. The advantage of the invention is that formic acid can be used against nematodes of domestic, wild warm-blooded animals and humans. Also, this invention can be useful for the prospective development of multi-component veterinary anthelmintic preparations.
