bacterial infection
"I have taken doxy before and was fine both then and now .I was taking it for a sinus and lung infection.
I have no complaints as long as I stick to the instructions . 
ALWAYS drink A WHOLE GLASS OF WATER  (250 ml's +)  with the dose . 
avoid dairy foods 
and avoid anything high in metals  iron, magnesium, zinc etc.
DON'T lie down for at least 20 minutes after .
no side affects ."