Doxycycline
"Day 3 of Monodox: my acne is starting to clear up. I'm on 75mg 1x a day. Sinus stuffiness/drainage, diahrrhea, muscle weakness, and a headache when I run too hard. I've read really good things about this medicine, that's why I opted to fill my prescription. SUPER EXPENSIVE without insurance and a discount card my Dr gave me. Hope the side effects subside."