A child-resistant and senior-friendly unit dose package has a hollow container body containing a separate tray carrying a plurality of tablets or like items for being dispensed from the container body. The container body has an end with an opening, and the tray can be slid to a retracted position in which the tray is located within the container body and a dispensing position in which a proximal end part of the tray extends through the opening of the container body. The package includes a separate cap removably securable to the container body to seal the opening and prevent access to the trays. The container body can be positioned in a tray re-loading position that permits a spent tray to be removed from the container body and replaced with a new tray. Thus, the container body is reusable.