bacterial infection
"I had minor surgery and developed cellulitis and was put on doxycycline. It made some immediate improvement in the pain and swelling. The culture came back as MRSA. 10 days of doxycycline was extended for 2 more weeks, but after 5 days, with infection not completely gone, I switched to vancomycin infusions for 25 days until I was considered healed. The problem wasn't the medication, rather it was the lousy suturing with internal stitches that started emerging through the wound for weeks, keeping the infection deep in my thigh. Then I got a bad cold or flu with a terrible sinus infection so I started taking the remaining doxycycline. I don't think I've taken it for sinus before, but I felt better right away and no real side effects. Great!"