Over the course of time, I was on Doripenem, Meropenem twice, Zosyn, and Cefepime. Each one was for at least three weeks and twice, the ID extended it for another week - I think the Doripenem and Cefepime because I hadn't cleared enough infection at the end of the third week. After each time, I usually had three or six good months until the cough came creeping back. That's why I am so thankful to be on the inhaled Colistin.