I started on Nitrofurantoin 100mg 2x daily on 6/5/18 for a UTI which I haven't had a UTI in 20 years. Anyway, I woke up the next day with chest pain and a bit of a cough and pain when coughing. I called my dr. and he said he didn't think it was from the medication and said to keep taking it, but that is contrary to what I am reading online about this medication. It says to stop it if you have a cough and chest pain. Now I have had 5 doses and it is a day later and my cough is more frequent and my chest pain is worse, but dr. says to keep taking. I am worried about irreversible damage to my lungs. I already have a history of asmtha, but never had chest pains like this. It hurts to breath in or move around.