Figure 4: The effects of C. zeyheri extract on drug efflux from B. subtilis (A) and E. coli (B) using rhodamine 6G. Bacterial cells which were exposed to glucose had the least amount of the dye left in the cells, thus, indicating active efflux with glucose serving as a source of energy. Cells exposed to glucose and the plant extract retained a higher amount of dye, thus, indicating the inhibition of the efflux of the dye from the cells. Reserpine, a standard inhibitor efflux inhibitor showed the inhibition of drug efflux.