Thanks for the response. I'm currently taking paracan which I think has similar ingredients to paragone. I'm asking about the giardia because for the last two months I've been experiencing nausea, abdominal cramping and loose stools. My doctor thinks I may have this and has done the stool test and it's come back clear, she wants me to take Flagyl to see if it clears my symptoms up. I'm really hesitant about taking this medication, I don't want to kill off any good bacteria. I had alot of Antibiotics at the start of this year and think I developed a candida overgrowth anyway my tummy hasn't really been the same since but these symptoms are new. I will finish the course of paracan and see how I feel, I might try the paragone. Have you noticed how when you try to talk to doctors about parasites they have no idea?? I asked my doctor lots of questions about parasites and bowel flora and she said I was asking her too many questions that she couldn't answer. No wonder these forums are so active!!! I've gotten far more information here than I would from any doctor. Thanks again!! :)