My husband was prescribed sulfamethoxazole and trimethoprim. After taking the medicine for 9 days, he broke out with red bumps (rash) on both of arms, and he complained about being itchy. Now he has them on his legs as well. I did some research and found out this website. After reading some of the side effects I am pretty sure that his rash is due to taking the medicine. He will follow up with the doctor just to make sure. I'm glas I found this website. Thanks!!!