FIELD: medicine.
SUBSTANCE: invention refers to methods for producing 4-hydroxy-2-methyl-N-(5-methyl-2-thiazolyl)-2H-1,2-benzotiazin-3-carboxamides-1,1-dioxide (meloxicam) of formula 
of a high degree purity. In one of the ways potassium salt monohydrate of meloxicam of formula 
is dissolved, which is produced by interaction of meloxicam formula (II) with potassium hydroxide or potassium carbonate dissolved in water or in a mixture of water and organic solvent and, if desired, crystallisation of this monohydrate potassium salt of meloxicam of formula (I) in water or in a mixture of water and organic solvent, insoluble impurities are removed and the resulting solution is processed with organic or inorganic acid and crystallise meloxicam. The invention also refers to potassium salt monohydrate of meloxicam of formula (I) and method of its production, as well as to anti-inflammatory pharmaceutical composition based on it.
EFFECT: improvement of composition efficacy.
18 cl, 4 ex
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