Cipro (ciprofloxacin) is prescribed to treat infections caused by bacteria. It works by slowing down the multiplication of bacteria helping your body to fight off the infection. You should be very careful about combining Cipro with any other medicines to avoid interactions. The most commonly reported side effects include nausea, vomiting, insomnia, nervousness, skin sensitivity, dizziness and agitation. It's important to keep taking this medication even when your symptoms improve significantly, otherwise a relapse of infection can occur.