Can bactrim be used to treat a spider bite?

i had 2 spider bites (brown recluse) and was bitten a few years before that by the same kind of spider. I got prescribed Bactrim and it was not only effective, it went away with no lancing or cutting on the wound. The first time i was bit, they lanced it and made it worse, that ended with emergency surgery on my forearm so i wouldnt lose my hand due to the swelling cutting off circulation in my hand. So take BACTRIM as a better and less painful treatment.