A pharmaceutical composition which comprises particles of a finely divided pharmaceutically acceptable water soluble diluent coated with microcrystalline particles of nifedipine the majority of which have a particle size of 100 micrometres or less in the presence of polyvinylpyrrolidone the polyvinylpyrrolidone being present in an amount of from 10 to 90% by weight based on the weight of the nifedipine. The incorporation of polyvinylpyrrolidone in an amount of less than the amount of nifedipine ...