I took my last Cipro tablet this morning. Had an intestinal bacteria. LiquiPoop for 6 days. I've had Giardia twice over the years. Giardia never gave me diarhea. Instead, I just have frequent bm's, a constant vague feeling of impending nausea, and depression... which goes away immediately after I take antibiotics and get rid of it. But I still drink mountain water --selectively.