I had a reaction, got sick
for one day, but the pain was gone
for a week after that (not taking the Bactrim). After the pain came back, I was instructed to try the Bactrim again; got sick almost immediately, and again the pain was gone for a week. I have not taken the Bactrim since that one.
Well, I finally got an ultrasound. I was informed that I had "a bit" of gynecomastia in the right nipple.