Acne
"I have tried nearly every antibiotic (doxy, mino, ampicillin, etc) for acne prescribed by 3 dermatologists over 5 years. The only one that worked was doxycycline, which stopped working after 4 months. Then I tried bactrim which cleared my moderate-severe teenage acne gradually (and noticeably) over 1.5 months. Deffinetly the most effective one out there besides accutane."