FIELD: medicine. SUBSTANCE: method involves repeated dosing of liquid preparation of pharmaceutically active substance having predetermined composition from multiple-dose container of predetermined volume. Dosed quantity is selected as 1/N of volume of multiple-dose container, where N is whole number with value of from 2 and higher. Apparatus has holder 1 for multiple-dose container 2 having movable rear wall 5 working as piston 6 for replacement of liquid preparation from container, and piston stem 7 provided with releasable blocking devices 11,14,19,22, which are made such that displacement of piston stem is restricted to predetermined length in accordance with volume replaced from 1/N multiple-dose container, where N is whole number with value at least equal to 2. Apparatus is used for multiple parenteral injections effectuated by means of injection casing. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 14 cl, 2 dwg, 1 tbl
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