Bactrim Side Effects: I'm taking the generic form of Bactrim ds 2 tabs every 12 hours , http://www.medications.com/effect/view/27259 I'm taking the generic form of Bactrim ds 2 tabs every 12 hours , my stomach aches and i am having a fever of 100.9 - 102.0 after 5 days. It's done nothing for my swollen lymph node . I developed a boil behind my ear and had to have it lanced my lymph nodes You probably have a staph infection! That could be very serious, Tue, 19 Feb 2008 23:51:23 -0500 http://www.medications.com/effect/view/27259?item=4953 You probably have a staph infection! That could be very serious, have a blood test ASAP! Bactrim will not fight it, doxicycline will. http://www.medications.com/effect/view/27259?item=4953