the invention relates to a composition of excipients and pharmaceutical forms of sustained release and increased drug bioavailability for poultry and pigs and to a method of producing the same , said composition comprises : pharmaceutically active agents , bioavailability promoting agents , polymers for prolonged release of the drug , colouring agents , and flavouring agents . the composition of excipients and pharmaceutical forms of the invention optimizes the dosing of the drug dosage and generates resistant strains of bacteria by optimizing the ratio between pharmacokinetics / pharmacodynamics of drugs . the composition has different forms and colours that allow the product to be identified and accepted more easily by the bird or pig .