A closure system includes an inner cap including a plurality of driving structures disposed proximate a periphery of a top surface of the inner cap, a child proof element separated from the inner cap configured to be assembled with the inner cap to form a child proof cap, and a key having a plurality of projections. The child proof element when assembled with the inner cap in a child proof mode is configured to require the plurality of projections of the key to engage at least a portion of the plurality of driving structures of the inner cap to remove the assembled child proof cap when the child proof cap is installed on the container.

A drug delivery and patient reminder system is disclosed. The system includes an upper vessel adapted to attach to a lower vessel or existing medicine bottle. The upper vessel is closed with a cap and provides a separate compartment for placing a specified quantity of a medication, for example, one week's worth of medication. The remainder of the medication may be stored in the lower vessel compartment. The upper vessel may be reversible to allow a larger joint compartment to be formed. In this mode, the container may be turned upside down and a level indicator indicates when a certain quantity of medication remains, such as one week's worth of medication. A flanged cap provides a base of support and optional dispensing cup.

A closure system includes a non-child resistant cap configured to screw on and off a container in a non-child resistant mode. The system further includes a child resistant element configured to be able to be assembled with the non-child resistant cap to convert the non-child resistant cap to a child resistant cap permitting a push-down-and-turn action to remove the child resistant cap from a container. A child proof element is separate from the child resistant element is configured to be able to be assembled with the non-child resistant cap to convert the non-child resistant cap to a child proof cap requiring a key to remove the child proof cap from a container.

A child proof closure including an outer cap having a set of spaced apart apertures extending through a top surface of the outer cap, an inner cap dimensioned and configured to be assembled within the outer cap having a set of spaced apart receivers corresponding to the at least one set of spaced apart apertures of the outer cap, and a key having a set of spaced apart projections dimensioned and configured to be inserted through the spaced apart apertures of the outer cap to engage the spaced apart receivers of the inner cap when the spaced apart apertures of the outer cap are vertically aligned with the spaced apart receivers of the inner cap for unscrewing the assembled closure from the container by turning the key.