Sulfamethoxazole / trimethoprim
acne
"I was prescribed this a few months ago, I took the first day's pills and had a HORRENDOUS headache, but I'd taken many medications before it and had pretty similar experiences and the side effects usually dropped after a week or two. So i kept at it with this stuff for another 2 1/2 weeks, and still the same headaches. So i stopped taking it, I didn't notice a change in my skin either. Maybe I'm just sensitive to this."