Riazole 500 mg Tablet 20 Pcs Riazol pills contains metronidazole with very efficient action against entamoeba histolytica, anaerobic bacteria and giardia lamblia. Riazol tab is Riazol antibiotic used in Ameba treatment and Bacterial infection treatment Riazol is antibiotic also used in surgy and amobiase and giardiasis therapy.