Azithromycin
"I'm 43 with a life long history of bronchitis. When I get sick, I often find myself coughing until I vomit. I have been prescribed the "Z Pack" several times. I have found that, while it does ultimately take care of the bronchitis, it takes at least 7-8 days from the time I start the medicine until I begin to feel relief. In fact, during this current episode, my symptoms continued to worsen until today, which is the day I took the last pill. I don't yet feel any better, but today I am not getting any worse. This is consistent with each of the other times I have been prescribed this medication. I typically don't have major stomach issues while taking the medicine, but on occasion have had issues the first and second day."