according to the present invention is stored under inert condition for example packed under nitrogen atmosphere fig2 clearly indicates the dsc of form o of ceftiofur sodium obtained by the process of the present invention is different from the form d the starting material of the present invention can be prepared or obtained by utilizing the process available in the prior art for example prepared by utilizing the technique available in wo 2007 042917 crystalline materials are preferred in most pharmaceutical applications since crystalline forms have better flow properties and are thermodynamically more stable than amorphous forms of the same substance this thermodynamic stability is reflected in the lower solubility and improved physical stability of the crystalline form the regular packing of the molecules in the crystalline solid denies the incorporation of chemical impurities hence crystalline materials generally possess higher chemical purity than their amorphous counterparts in one more embodiment of the present invention the ceftiofur sodium obtained according to the present invention having good stability over conventional amorphous ceftiofur sodium and also has less residual solvent over the amorphous sample prepared by prior art the following table provides a comparison of physical characteristics of amorphous and crystalline ceftiofur sodium form o from this table it is evident that the crystalline.