Check out this website about bactrim ds. http://briandeer.com/septrin/bactrim-effects-23.htm
You probably have an allergy to Sulfa drugs. I found this out after taking Bactrim DS for a UTI. It took 5 wks to recover for me, but my rash was mild and went away in about a week. I had severe joint pain and fatique among other things. Hope you are well.
Hello,
Sometimes hives can take at a maximum of 6 weeks also to cure completely.Keep on taking the antihistaminics and apply calamine lotion on the itchy areas.You can also take Claritin or Zyrtec for the itching as they cause less drowsiness than Benadryl.Also apply a mild steroid cream on the itchy rashes and pls don’t scratch them.If the hives don’t go after 6 weeks also,then pls get yourself evaluated as it may be due to autoantibodies.
Take care and do keep us posted on how you are doing.Kind regards.