A pharmaceutical container including a bottle having a bottom wall and side walls. A ridge proximate to the bottom wall projects from an interior surface of at least one of the side walls, to facilitate nested stacking of a plurality of bottles. One or more of the side walls includes a cover locking receptacle proximate to the top end of the side wall. The pharmaceutical container also includes a cover including a sliding lid contained in a cover housing. The cover housing has a top wall, which includes an opening, and cover side walls. A bottle locking lug projects from the exterior surface of at least one of the cover side walls. This bottle locking lug is adapted to engage the cover locking receptacle of the bottle.