I took Cipro off and on many years ago due to urinary tract infections and had no problem with it. The last time, and I do mean the last time, I took it was approximately 14 years ago. I believe it was the second day of dosing that I became extremely paranoid. I went to a local grocery store to buy groceries. I felt as if everyone was staring at me and talking about me. I paid for my groceries and the cashier gave me my change, which I did not realize (for some odd reason). Now, I am not a confrontational person at all. I began arguing with the cashier that she did not give me my change back, all the while holding the money in my hand. I caused such a scene. I knew the manager as he went to our church. He came over and asked me what was wrong. I told him the cashier had not given me my change and that she was arguing with me that she had. He reached over and took the change out of my hand and gave it to me. Needless to say, I did not go to that grocery store for a while, as I was so embarrassed. I went home and called the emergency room as I had a feeling it was the Cipro, whatelse could it have been. The nurse told me paranoia can be a side effect. It is now on my chart that I am allergic to Cipro. It was just horrible.