bacterial skin infection
"I was prescribed Bactrim twice a day for 10 days.  The first day was ok by 2nd day I had a bad case of nausea and itchy.  3rd day nausea, fatigue, flu like symptoms and feeling cold along with insomnia.   I stopped taking it and gradually I'm feeling myself.  I continued keflex until the infection healed.   I won't take it again.  It's not worth the misery in my opinion."