Single Dose Antibiotic Treatment of Acute Watery Diarrhea, Rifaximin Versus Azithromycin, With Loperamide Adjunct

Rifaximin 550 mg as a single dose administered orally.

Azithromycin 500 mg as a single dose administered orally.

4 mg loperamide administered orally with study antibiotic (rifaximin or azithromycin). Additional loperamide to use as needed, but not to exceed 16 mg/day for 2 days as per licensed use (one 2 mg capsule after each looses stool).