I have taken cipro and flagyl together several times and I have taken Cipro by itself in the past with no problems. However, over the past week, I have continued to have symptoms of an allergic reaction that responds to Benadryl. But today, when I take the Benadrl and it wears off, the allergic reaction, whelp sunder the arms, etc come back. My wife is a nurse and told me to stop the medications this morning and I did, yet within the last hour the whelps have come back. Is it unusual for you to show signs of allergic reaction to these medications now even if I have never had them before with no reaction?