Patent ID: 7659405

Claim:
A process for preparing a pharmaceutical composition comprising ritonavir, said process comprising dissolving Form II crystalline ritonavir in a pharmaceutically acceptable organic solvent, wherein said Form II crystalline ritonavir has characteristic peaks in the powder X-ray diffraction pattern at values of two theta of 8.67°±0.1°, 9.88°±0.1°, 16.11°±0.1°, 16.70°±0.1°, 17.36°±0.1°, 17.78°±0.1°, 18.40°±0.1°, 18.93°±0.1°, 20.07°±0.1°, 20.65°±0.1°, 21.71°±0.1° and 25.38°±0.1°.