PURPOSE:The titled gradually releasing tablets that are prepared by coating particles of indomethacine, as an active ingredient, with a hydrophilic high- molecular film-formig substance and ethyl cellulose at a specific ratio respectively, thus showing tabletting properties (stable with time) with gradual release behavior imparted. CONSTITUTION:The objective indomethacine gradually releasing tablets are prepared by using a mixture of powdery indomethacine as an active ingredient, (a) a hydrophilic high-molecular film-forming substance as a stabilizer, preferably selected from hydroxypropylcellulose, hydroxypropylmethylcellulose, hydroxypropylmethylcellulose phthalate and polyvinyl pyrrolidone, much preferably hydroxypropylmethylcellulose phthalate and (b) ethyl cellulose as a gradually releasing agent in proportions of 1-50, preferably 3-20wt% respectively. The weight ratio of (a) to (b) is preferably 1:9-5:5.
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