Abstract: A tamper-resistant, child-resistant container having a lid slidably secured to a receptacle is disclosed. The lid is provided at one end with a flap or tongue perpendicular to the plane of the lid and parallel to a side of the receptacle in a locked state of the container. Upon an attempt to unlock or initially reclose the container, ribs on the flap undergo a visible deformation. In addition to or alternatively to the ribs, the lid may be provided with one or more scores, perforations, notches or incisions, or otherwise weakened, causing a severance of the flap upon an initial opening and/or attempted reclosure of the container. The container can also include a child-resistant feature provided by frictional engagement of the lid and receptacle.