Get emergency medical help if you have signs of an allergic reaction to Cipro (hives, difficult breathing, swelling in your face or throat) or a severe skin reaction (fever, sore throat, burning in your eyes, skin pain, red or purple skin rash that spreads and causes blistering and peeling).
Ciprofloxacin can cause serious side effects, including tendon problems, damage to your nerves (which may be permanent), serious mood or behavior changes (after just one dose), or low blood sugar (which can lead to coma).
Stop taking this medicine and call your doctor at once if you have:
low blood sugar - headache, hunger, irritability, dizziness, nausea, fast heart rate, or feeling shaky;
nerve damage symptoms - numbness, tingling, burning pain in your hands, arms, legs, or feet:
serious mood or behavior changes - nervousness, confusion, agitation, paranoia, hallucinations, memory problems, trouble concentrating, thoughts of suicide; or
signs of tendon rupture - sudden pain, swelling, bruising, tenderness, stiffness, movement problems, or a snapping or popping sound in any of your joints (rest the joint until you receive medical care or instructions).
In rare cases, ciprofloxacin may cause damage to your aorta, the main blood artery of the body. This could lead to dangerous bleeding or death. Get emergency medical help if you have severe and constant pain in your chest, stomach, or back.
Also, stop using Cipro and call your doctor at once if you have:
severe stomach pain, diarrhea that is watery or bloody;
fast or pounding heartbeats, fluttering in your chest, shortness of breath, and sudden dizziness (like you might pass out);
any skin rash, no matter how mild;
muscle weakness, breathing problems;
little or no urination;
jaundice (yellowing of the skin or eyes); or
increased pressure inside the skull - severe headaches, ringing in your ears, dizziness, nausea, vision problems, pain behind your eyes.
Common Cipro side effects may include:
nausea, vomiting, diarrhea, stomach pain;
headache; or
abnormal liver function tests.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Cipro side effects (more detail)
