Sulfamethoxazole / trimethoprim
"Day 3 on BACTRIM due to MRSA. Abscess was lanced and drained 5 days ago. Swelling/Pain of the abscess has finally begun remission. I did suffer from the reported migraine headache all day yesterday and it was quite debilitating,  but no such headache today and I'm finally back at work. Also suffered from some seriously painful abdominal cramps that produced very loose/watery stool. Not much of an appetite today and feeling a little shaky so make sure you eat even if you don't want to. This drug is definitely very effective for treatment of MRSA. If the migraines were constant as others described I wouldn't not be back at work today. 

All my best wishes to everyone reading this."