Monensin (Monensin A), an orally active antibiotic, is an ionophore that mediates Na+/H+ exchange. Monensin is a potent Wnt signaling inhibitor. Monensin causes a marked enlargement of the multivesicular bodies (MVBs) and regulates exosome secretion. Monensin can be used for bacterial, fungal, and parasitic infections research, and shows anticancer effects[1][2][3][4].