FIELD: medicine, pharmacy. SUBSTANCE: invention relates to novel and early unknown form of ranitidine hydrochloride showing property of H2-blocking agent. Invention relates to roentgen-amorphous form of ranitidine. Roentgen-amorphous form is physically stable and invention describes also method for preparing roentgen-amorphous form from its early known crystalline modifications. Invention provides preparing a novel roentgen-amorphous form of ranitidine hydrochloride showing the enhanced specific antiulcer activity. EFFECT: improved preparing method, valuable medicinal properties. 12 cl, 2 dwg, 1 tbl
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