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Survey on the main veterinary medicines use in dairy cattle in the state of Parana - Brazil. The veterinary medicines use in the dairy cattle's health programs for prevention or treatment of diseases can affect milk and dairy products. The contamination of food by residues of veterinary medicines can be potentially harmful to consumers. One hundred and sixty business organizations (cooperative, delivery and medicine peddlers) located in 76 cities of the state of Parana - Brazil were studied from September to October 2003. As initial phase of the Program of Veterinary Medicines Control in Products of Animal Origin (PAMvet-PR) a survey on the use of veterinary medicines in the main diseases of the dairy cattle of the Parana was carried out. The antibiotics (beta-lactam, aminoglycosides, tetracyclines) and the antiparasitics (avermectins, pyrethroids, organophosphates) were the main group. The identified compounds should be prioritized in monitoring programs of veterinary medicine residues in milk in the state of Parana.