I was prescribed Prevpac (lansoprazole, amoxicillin & clarithromycin) for the H. pylori they found in my stomach. I've had 2 days of the drugs and I'm begining to get diarreah. I'm afraid it may get worse (I had a similar problem when I was prescribed clindomycin by a dentist and had a C. difficile invasion and I was bedridden for 6 weeks). I've been taking Flora-Q bacillius mix in the mornings and yogurt in the evening hoping to reduce the effect of the antibiotics but I don't feel they are helping much. Has anyone had a similar experience? I don't want to wait too long as I did with the clindomycin mishap, before I call the GI and tell him I need help. Also, I'm in the middle of classes and I'm not sure how I will be able to handle an increase in the diarreah. Any advice or encouragement would help.