i took nitrofurantoin for a UTI for two weeks, finishing the medication on August 23. on September 1, I noticed a few itchy bumps on my neck. these gradually increased over the next two weeks into a very symmetrical rash of small, dot- like, raised itchy bumps all over my chest, shoulders, upper back and upper arms. I've also had a weird chemical taste in my mouth. I called my doctor last week and he said to take Zyrtec, and if that doesn't help to call him back. I've been taking the Zyrtec for a week, and the rash has calmed down but not gone away. I'm planning to call him back tomorrow. I just wondered what your opinion is. I am female, 49, in good health, have yearly physicals. I think this a is an allergic reaction to the antibiotic.