pneumonia
"Was prescribed for pneumonia, followed directions, no missed doses, after first and second pill still felt sick, from day three on, the sick feeling was much weaker, but massively fatigued, after ten days I am more fatigued then before I started doxycycline, and still congested. Last time amoxicillin took away all symptoms in 4 days and its cheaper, with just upset stomach and nausea as symptoms."