FIELD: medicine, chemical-pharmaceutical industry, pharmacy. SUBSTANCE: invention relates to producing 5-amino-2,3-dihydro-1,4-phthalazinedione alkali metal salts and their mixture by interaction of 5-amino-2,3-dihydro-1,4-phthalazinedione with alkaline metal hydroxides (Li, Na, K) or mixture of these metals and the following isolation of end products by crystallization from reaction mixture saturated solutions. Method provides preparing medicinally pure product by simple and fire safety method. EFFECT: improved preparing method. 23 cl, 1 dwg, 6 ex
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