Doxycycline
urinary tract infection
"This is the 4th time taking this in two years and it does make me sick (it's for acne and UTI). Upset stomach etc.. But I can’t really take the other antibiotics they give me hives and fast heart rates. The most disturbing thing I’ve noticed the last 2 times using doxycycline I’ve had breakthrough vaginal bleeding and NO I’m not on birth control and have very regular periods when I’m not taking doxycycline.. It normally takes a while for my period to go back to normal after I take them. Anyone else had this issue?"