Nitrofurantoin
"I took this drug had blinding headache pain behind my muscles so week I could hardly move but the worst thing was pain in my chest and difficult  breathing rang doctor  said u may  have flu saw him next day after stopping  tacking itstill should no concern at all  just seen another doctor said she was not not not aware of such side effects told her to go on this  site I don't know how anyone with concern for there patients can prescribe this drug without  warning them first do not take if u have bad chest. at all"