Amebiasis was diagnosed in a Vietnam veteran and treated in a conventional manner with diodoquin and tetracycline. Symptoms persisted over the next three and one-half years despite repeated courses of diodoquin. Amebic colitis was confirmed by biopsy through a sigmoidoscope. The patient then received a ten-day course of metronidazole (Flagyl). Studies are cited proving this single agent is the drug of choice in the oral therapy of all clinical forms of amebiasis.
Bode, Frederick R. and Van Volkinburg, Earl J.
"Biopsy-Proven Amebic Colitis Treated with Metronidazole,"
Henry Ford Hospital Medical Journal
: Vol. 20
Available at: https://scholarlycommons.henryford.com/hfhmedjournal/vol20/iss3/6