Doxycycline
"I think the people doubting the effectiveness of doxycyline on their bronchitis either have a rare allergic reaction, aren't being diagnosed properly, or they're improperly associating their negative symptoms with the doxycycline. I've been taking one pill twice a day for the last 60 hours -- every time on an empty stomach -- and I've had absolutely no negative symptoms. Not even gastrointestinal. Been feeling better every day. The ones discouraging use are a loud minority"