well do a stool R/E.it will show the cause of it.experts say that if possible, the administration of medications to kill the cause of the dysentery should be held back until lab tests determine whether the illness is being caused by a bacterium or amoeba. If doctor determines it is Bacillary dysentery (Shigella), the patient most likely will receive no medication - in the vast majority of cases the illness will resolve within a week. Oral rehydration is important. If amoebic dysentery is diagnosed the patient will probably start with a 10-day course of an antimicrobial medication, such as Flagyl (metronidazole). Diloxanide furoate, paromomycin (Humatin), or iodoquinol (Yodoxin) may also be prescribed to make sure the amoeba does not survive inside the body after symptoms have gone.