A reconstitution device (10) for mixing a first component (70) with a second component (72) wherein there are provided first and seconds housings (12, 14) which are engageable together, a conduit (28) having an internal passageway (30) having a dispensing end and an inlet end, first, second and third plungers (52, 54) mounted in said internal passageway (30), first and second compartments (70, 72) being defined by the plungers, a shearing channel (32) formed in a side wall of conduit (28) to permit mixing of contents located in the first and second compartments (74, 76), a plunger rod (58) to cause initial mixing of the first and second components (70, 72), and a spring member (48) biasing against the moveable member (42).