Phenytoin is a simple organic pharmaceutical material that exhibits a phase transition at low temperature to a new phase. The high temperature form exhibits some unusual behaviour whereby the systematic absences suggest a higher symmetry phase than is actually observed. On cooling below 190 K the crystal structure changes to a larger cell where the molecules show modulation along the long axis. Initial single crystal X-ray studies have suggested a number of novel unit cells but the best fitting cell is extremely large (a = 13 b = 43 c = 15). Unfortunately a large portion of the data are below 2 sigma in intensity. It is anticipated that an experiment at HRPD will provide further evidence for this new phase and allow its full characterisation.