On day 12 of a 14 day treatment of Septra DS the backs of my thig...

On day 12 of a 14 day treatment of Septra DS the backs of my thighs began to itch. I thought I might have gotten a heat rash from the vinyl padded chairs at my work. Just to be safe I stopped the meds because I have a history of antibiotic allergies. That was on a Friday. By Monday afternoon I had to leave work early to rush to my doc who said I probably had a rash from the bronchitis I was treated for (something called viral exanthem). I didn't buy it but trusted the doc. Two days later I was in agony. I itched EVERYWHERE! Relentless horrible itching. I took 2 full strength benadryls every 3 hours to no avail. Tried calamine lotion,etc. Nothing worked. The doc finally gave me 40 mg of prednisone for 5 days. But it's day 3 of the steroid and I started itching horribly again last night. I know it's the sulfa because I now remember some slight itching the last time I took it. So beware... itching on sulfa is a red flag... your skin is telling you something!