FIG. 3A is a front view of another embodiment of a prescription filling apparatus (with the housing removed), having a single carousel 16 on the left side while FIGS. 3B, 3C, 3D and 3E are a perspective view from the back left, a plan view of the back, a top view looking down, and a left side view, respectively, of the prescription filling apparatus of FIG. 3A;