Ciprofloxacin
"Diagnosed with a UTI.  It was either in its very early stages or my own immune system was doing a fair job combating the infection since I didn't realize I had the UTI until a general Wellness exam revealed it's presence.  My Doc prescribed Cipro, 500mg X2 daily for a week.  I had never taken this type/class of antibiotics AND I had no known allergies of any kind.  About a half-hour after swallowing the first pill I felt hot, dizzy, nauseous and within five minutes of those symptoms, I started violently vomiting....the kind of projectile launching that feels like it originates in your toes.  About an hour later, shaking and weak, I contacted my doctor's office for a different Rx.  I'll never again take Cipro-Floxa-anything."