Hi, I am suffering from diarrhea for the last two months. O have had zifi, norglox TX and another antibiotic recently, bit my diarrhea is not healing It is like dark tarry motion three times a day. With y last antibiotic diarrhea had got worst. Soon after meals I had to go. But since the course ended it has now subsided to three times a day. I. The first hard or night. I am also having a probiotic VSL.