A package has a sliding blister card and a locking sleeve made from a base and a top. The card is made from conventional blister dose packaging material, with blisters formed in a single layer plastic top holding medicaments on a sealing paper, board, or foil layer. The top and base form a closed case, open along one end. The blister card is slid into the sleeve until detent(s) engage aperture(s). Appurtenant(s) adjacent to the detent(s) urge the blister card to engage the detent(s) at the card's receiving aperture. Pressing on release disengages the card and detent by warping the card to move the aperture away from the detent so that the card may be slid through the open end of the sleeve. Reverse pressure easily slides the blister card back into the containment element without manipulation of parts.