Treatment of Amoebic Dysentery

Diagnostic Approach

Microscopic confirmation is essential before initiating treatment for amebiasis, as amebic dysentery tends to be misdiagnosed, according to the Centers for Disease Control and Prevention 1, 4, 5
Stool specimens should be examined by microscopy to identify Entamoeba histolytica trophozoites, as recommended by the Centers for Disease Control and Prevention 1, 4
Care must be taken to distinguish large white blood cells (nonspecific indicators of dysentery) from actual amebic trophozoites, as noted by the Centers for Disease Control and Prevention 1, 4
Treatment for amebiasis should not be considered unless microscopic examination shows amebic trophozoites OR two different antibiotics for shigellosis have failed, according to the Centers for Disease Control and Prevention 1, 5, 2

The Centers for Disease Control and Prevention recommends metronidazole 750 mg orally three times daily for 5-10 days as the first-line therapy for amoebic dysentery 1, 2, 3, 6
For children, the recommended dose is 30 mg/kg/day for 5-10 days, as suggested by the Centers for Disease Control and Prevention 6
Cure rates exceed 90% with metronidazole treatment, and most patients respond within 72-96 hours, according to the Journal of Infection 7, 8
The Centers for Disease Control and Prevention also recommends a luminal amoebicide, such as diloxanide furoate or paromomycin, after completing metronidazole or tinidazole to reduce relapse risk, even with negative stool microscopy 7, 8
Diloxanide furoate should be given 500 mg orally three times daily for 10 days, and paromomycin should be given 30 mg/kg per day orally in 3 divided doses for 10 days, as recommended by the Journal of Infection 7, 8

If microscopy is unavailable or definite trophozoites are not seen, patients with bloody diarrhea should be treated initially for shigellosis, according to the Centers for Disease Control and Prevention 1, 4, 5
Only after failure of two different antibiotics for shigellosis should amebiasis treatment be considered, as noted by the Centers for Disease Control and Prevention 1, 5, 2
Amebic dysentery is frequently misdiagnosed, and the tendency to overdiagnose amebiasis leads to inappropriate treatment and delays proper management of bacterial dysentery, according to the Centers for Disease Control and Prevention 1, 4, 5, 2, 6
Failure to follow tissue amoebicide with luminal amoebicide results in treatment failure and relapse, as reported by the Journal of Infection 7, 8