The present invention provides a pharmaceutical composition of telmisartan comprising a) a telmisartan compound, b) a surfactant, c) a basic agent, and d) at least one diluent wherein the composition comprises less than 25% of water soluble diluents. The telmisartan compound is preferably present from about 12.5% to about 15.5%. At least one water insoluble diluent is preferred for use in the pharmaceutical composition in an amount from about 40% to about 70% of the total weight of the pharmaceutical composition. A preferred water insoluble diluent is microcrystalline cellulose. Also described are a pharmaceutical composition comprising telmisartan having a powder X-ray diffraction pattern, methods of preparing such pharmaceutical composition, and a crystalline form of Telmisartan.