A veterinary sustained release injection comprises of ethyl cellulose (EC) and therapeutical drugs. The injection characterizes that EC doesn't disperse in form of drug-loading particles, such as microspheres or microcapsules present in the medium of the injection, but dissolves or swells in the medium. When it contacts with water or fluid, hydrophorbic drug present in it combines with EC to form semisolid mass. Thus, the diffusion of active ingredients is limited to achieve sustained release. The present formulation is suitable for subcutaneous injection with slow release in a long period.
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