Female, 30 years old. Began taking five day course of z-pak for bronchitis., abdominal pain from the beginning, better with food. Day five, abdominal pain much worse, ending with diarrhea. Did not take last dose. Day six, diarrhea persisting, frequent watery stool, dizziness, appetite loss, feeling completely drained. Day seven, began taking anti- diarrheal, seemed better. Went to Dr., advised fluids of course. Later that day, managed to eat a good meal, pushing fluids. Some intestinal pain but feeling generally better. Then: anti- diarrheal not really working anymore. Constant watery stools, feeling severely fatigued, completely drained, dizzy, ringing in ears, chills. Called hospital and spoke to nurse, advised ER visit: probable dehydration. I have been sick for 18 days including z-pak. Would never recommend this medication. The side effects are worse than the bronchitis.