Characterization of different crystal forms of iboprofen, tinidazole and lorazepan

Different crystal forms of lbuprofen, tlnidazole and lorazepam were prepared and subjected to physlcochemlcal tests like particle size, shape and melting point determination, scanning of U.V., I.R. and N.M.R. Patterns, stability, dissolution and diffusion rate studies. The nature of solvents and method of ndcroprecipitation effect different properties of crystal forms of the drugs.