bacterial infection
"I'm on 400mg 3 times a day and doxycycline 100mg once a day for a week. So far I've had some nausea, headaches and keep getting waves of tiredness. Not good as I work night shift and I'm tired enough as it is. However it is doing the trick as my infection is clearing up. Just recommend when you take them put the water in your mouth first then the pill and swallow it quickly as it tastes bad."