FIELD: metering devices for controlled ejection of pharmaceutically active preparation. SUBSTANCE: enveloping part of caps capsule is made of material liable to swelling in water and which after exposure in aqueous medium swells and after it under the action of aqueous medium on capsule, enveloped part is freed from enveloping part to eject by pulse the active material into aqueous medium. EFFECT: higher efficiency. 26 cl, 3 tbl
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