Abstract: The present invention relates to bioavailable pharmaceutical formulations of heterocyclic compounds, such as such as N-(3,5-dichloropyrid-4-yl)-4-difluoromethoxy-8-methanesulfonamido-dibenzo[b,d]furan-1-carboxamide (oglemilast) and pharmaceutically acceptable salts thereof, to processes for their preparation and to methods of treatment using the same. The present invention also relates to substantially pure amorphous forms of heterocyclic compounds, such as oglemilast. The invention is particularly directed to bioavailable pharmaceutical oral dosage forms containing amorphous oglemilast.