I have also been takeing Oracea (40mg doxycycline). But I keep getting yeast infections. I've had 4 in 9 months. The dermatologist thinks Oracea is not suppose to give you this, but the only thing that has changed in my life is adding antibiotics. When I took a break form the antibiotics I did not get a yeast infection. More recently I was taking a slow release of doxycycline-Monodox, but I got a yeast infection in 8 days from that.
Its depressing because the antibiotics help a LOT with my skin, my skin is almost flawless. But it is ruining my body so I guess I cant take them anymore. I'm pretty depressed about this because it seems that my dermatologist doesnt really know what to do anymore because my skin barely tolerates anything topical.