50 preferably at a concentration of 10 for dilution in drinking water and 30 for injectable route b a carrier of n methylpyrrolidone in the concentration ranging from 20 38 v v preferably between 30 and 38 v v c a second carrier consisting of glycerin in the concentration of 15 50 v v preferably between 20 and 40 v v and d a third carrier consisting of ethanol at a concentration of between 12 and 50 v v the composition has low viscosity of about 12 cps for a 10 formulation and up to 30 cps for a 30 formulation at 25 u00b0 c this formulation is readily filtered on sterilizing filters of 0 2 micrometers and can be administered by injectable route preferably in a concentration of 30 or in drinking water preferably at a concentration of 10 the invention object of this patent application can be best described by the following examples which should not be considered as limiting the scope of protection the constituents are mixed in a single or multiple steps preferably florfenicol was added to 30 ml of methylpyrrolidone and then ethanol and glycerin were added to under stirring the final product if desired can be filtered and then it was packed in glass or plastic vials florfenicol can be optionally added to 30 ml of n methylpyrrolidone.