A disposable intravenous flow control device (20) includes a rigid casing (21) defining a flow passage having a fluid entrance (23) and a fluid exit (22) a flow regulator (10) disposed in the flow passage of the casing (21) and comprising an annular flange (11) extending upward, a hollow, cylindrical protrusion (12) raised upward from a central portion, the protrusion (12) being open to the bottom, an open fluid storage (13) defined between the flange (11) and the protrusion (12), and a hollow, cylindrical skirt (14) extending downward from the bottom of the protrusion (12) and a suction cup (15) releasably secured to the skirt (14) for blocking the fluid exit (22) when fluid in the casing (21) is consumed.
