A closure cap for a container having a spout is described. The closure cap includes a tubular base, a flexible cover, and a flow restriction member. The tubular base is positionable about and sealingly engageable with the spout. The flexible cover is extends over the tubular base and movable between a non-depressed position and a depressed position. The flow restriction member is detachably mounted to the tubular base such that the flow restriction member is in a spaced, coaxial relationship with the spout when the tubular base is engaged with the spout and when the flexible cover is in the non-depressed position and such that the flow restriction member is detached from the tubular base and positioned on and engaged with the spout of the container when the flexible cover is moved to the depressed position.