Sulfamethoxazole and to no avail

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!

Oh my God! The itching is horrible! I woke up and my eyes crossed from the severity. I could not even go to work. After taking Sufameth/trimethoprim for 2 days (2 pills/da) for a UTI, my scalp started to itch. I scratched all day with a pencil...to no avail. Later that day, the vaginal and rectal itch was unmerciful. Vagisil maximum COULD NOT TOUCH it. I scheduled a gyne appointment because I thought, maybe I was developing something else...yeast infection. But there were no other signs. My husband suggested it could be an allergic reaction to the medicine. My nurse suggested I take an antihistimine like Benadryl. That provided some relief. Now I see similar postings on the web about severe itching. Thank goodness I only have one more pill of this 3 day treatment.

I took this for about three weeks for acne. I didn't have any problems for THREE weeks, then one day my back started aching. Then the next my hands and feet started itching. I didn't connect this with the sulfameth, until day four when, along with the muscle aches and itching, I had nausea and chills so bad I went to an urgent care clinic scared out of my mind. The doctor there said it was the sulfameth, and gave me a shot of something to stop the nausea and chills. That was a week and a half ago, and I still have the itching reaction. There's no visible rash--just insane itching. The urgent care doctor told me to take Benedryl, which I did to no avail. After a week, when it was clear the itching wasn't going to go away, I finally called my dermatologist who prescribed a prescription-strength anti-histimine. That helps to some degree, but the itching is still there, and my derm. said I could expect it to last for "a few weeks" despite the sulfameth not being in my system anymore!! I felt better after finding this site, knowing that I wasn't crazy, but I'm still angry about being prescribed this. Also-I had no appetite, but that is starting to come back slowly.