Ciprofloxacin is used to treat a wide variety of infections, including infections of bones and joints, endocarditis, bacterial gastroenteritis, malignant otitis externa, bubonic plague, respiratory tract infections, cellulitis, urinary tract infections, prostatitis, anthrax, and chancroid. Ciprofloxacin (Cipro) treats UTIs, pneumonia & more — but carries a serious FDA Black Box Warning. Learn safe dosage, side effects & drug interactions. Ciprofloxacin is used to treat bacterial infections in many different parts of the body. Ciprofloxacin oral liquid and tablets are also used to treat anthrax infection after inhalational exposure. This medicine is also used to treat and prevent plague (including pneumonic and septicemic plague). Ciprofloxacin is an antibiotic drug prescribed to treat a variety of bacterial infections (sinus, tooth, UTI, gonorrhea, prostatitis). Common side effects are headache, rash, and diarrhea. Medscape - Infection dosing for Cipro, Cipro XR (ciprofloxacin), frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation schedules, and cost. Ciprofloxacin: learn about side effects, dosage, special precautions, and more on MedlinePlus Find patient medical information for Ciprofloxacin (Cipro, Cipro XR, Proquin XR) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Ciprofloxacin is a fluoroquinolone (flor-o-KWIN-o-lone) antibiotic, it is used to treat different types of bacterial infections. It is also used to treat people who have been exposed to anthrax or certain types of plague. Ciprofloxacin extended-release is only approved for use in adults. Key takeaways: Ciprofloxacin (Cipro) is a fluoroquinolone antibiotic. It treats a wide variety of infections, including urinary tract, gut, and lung infections. The most common ciprofloxacin side effects are nausea, vomiting, and diarrhea. Skin rashes and liver changes are also possible. Ciprofloxacin was approved by the FDA in 1987 as the latest addition to the class of antibiotics known as fluoroquinolones. Doctors hailed it as a breakthrough — a broad-spectrum antibiotic capable of treating both routine and resistant bacterial infections.