Crystalline cephalosporin antibiotic salt

The .alpha.-monohydrate crystalline form of ceftazidime bishydrobromide having the following X-ray diffraction pattern:

• ______________________________________ d I/I.sub.1 ______________________________________ 14.85 .17 10.65 .50 9.94 .08 8.08 .29 7.66 .29 6.71 .25b 5.74 .38 5.37 .04 5.16 .04 4.77 .25 4.37 .83 4.22 1.00 4.04 .04 3.89 1.00 3.78 .17 3.56 .17 3.35 .21 3.29 .25 3.11 .25 2.93 .29 2.88 .25 2.79 .08 2.74 .17 2.70 .04 2.58 .08 2.54 .13 2.45 .13 2.24 .17 2.14 .08 2.09 .08 ______________________________________