Abstract: A safety closure cap and container is disclosed. The container is of vial variety having an open top and two vertically-spaced annular protuberances at its upper portion defining a groove therebetween. The cap is circular, having an inverted central dome and a wide outer annular portion integrally formed with a downwardly extending flange. The latter is formed with an inward projection adapted to releasably snap into the groove and includes a plurality of vertical slots circumferentially spaced-apart. The underside of the cap is formed with a fulcrum ridge and a fluid-proof sealing ridge.