doctor writing prescription
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What Are Fluoroquinolones?

These antibiotics treat or prevent certain bacterial infections. You’re more likely to know them by their generic or brand names:

  • Ciprofloxacin (Cipro)
  • Ciprofloxacin extended-release (Cipro XR)
  • Gemifloxacin (Factive)
  • Levofloxacin (Levaquin)
  • Moxifloxacin (Avelox)
  • Ofloxacin (Floxin)

Doctors prescribe these often, but they can cause serious side effects. You should know what to look for when taking them.

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woman with headache
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Common Side Effects

Some people who took fluoroquinolones reported:

  • Nausea
  • Diarrhea
  • Headache
  • Dizziness
  • Lightheadedness
  • Trouble sleeping
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joint pain
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Serious Physical Side Effects

There is a chance that your body will respond to these antibiotics with more severe reactions, including:

  • Tendinitis
  • Tendon rupture
  • Numbness or tingling, “pins and needles” in arms and legs
  • Muscle weakness
  • Muscle pain
  • Joint pain
  • Joint swelling
  • Irregular heartbeat
  • Ringing or buzzing in ears
  • Vision problems
  • Skin rash
  • Skin sensitivity to sunlight
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depressed young man
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Serious Mental Side Effects

Some people have reported emotional and psychological reactions while taking these drugs, including:

  • Anxiety
  • Depression
  • Hallucinations
  • Suicidal thoughts
  • Confusion
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boy with doctor
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When to Look for Changes

Serious side effects can start after the first or second dose.

Most people who reported them had one or more of these:

  • Long-term pain
  • Problems with tendons, muscles, and joints, including swelling, pain, and tendon rupture
  • Symptoms that lasted  longer than a year, which means they may be permanent

These side effects led to changes in quality of life such as job loss, financial problems, and increased family tension.

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black box warning
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Boxed Warning on Medication Label

The FDA put its strongest warning on the drug packaging.

You should know:

  • Fluoroquinolones carry a higher chance of tendinitis and tendon rupture.
  • It's greater for those over 60; in kidney, heart, and lung transplant recipients; and those taking steroid medications.
  • Stop taking the fluoroquinolone at the first sign of tendon pain, swelling, or inflammation. Avoid exercise and use of the affected area, and immediately ask your doctor to switch to a non-fluoroquinolone drug.
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woman reading drug label
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Look for the Medication Guide

Your prescription will come with FDA-approved information to help you avoid serious side effects.

Here’s part of the guide:

CIPRO ® (Sip-row) (ciprofloxacin hydrochloride) Tablets for oral use

Read this Medication Guide before you start taking CIPRO and each time you get a refill.  

There may be new information. This guide does not take the place of talking to your healthcare provider.

What is the most important information I should know about CIPRO?

  • CIPRO, a fluoroquinolone antibacterial medicine, can cause serious side effects.
  • Some of these serious side effects can happen at the same time and could result in death.

If you get any of the following serious side effects while you take CIPRO, you should stop taking CIPRO immediately and get medical help right away.

  • Joint pain, swelling, popping sounds, or muscle weakness
  • Tingling and possible nerve damage
  • Anxiety, depression, hallucinations, suicidal thoughts, confusion
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doctor talking to woman
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Benefits vs. Risks

For some types of sinusitis, chronic bronchitis, and urinary tract infections, the risks of fluoroquinolone drugs are greater than the benefits for most people.

For some serious infections, like pneumonia or infections inside the abdomen, the benefits of fluoroquinolone drugs outweigh the risks.

Your health care provider can talk to you about your best choice.

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What Do You Need to Do?

Before you take a fluoroquinolone, read the entire Medication Guide to understand warnings and side effects.

Stop taking Cipro and contact your doctor right away if you have any serious side effects after starting treatment, such as:

  • Unusual joint or tendon pain
  • Muscle weakness
  • A tingling or burning sensation
  • Arm or leg numbness
  • Confusion and hallucinations

Report any side effects to your health care professional and the FDA MedWatch program.

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medwatch website
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FDA MedWatch Program

You can report a bad side effect to the FDA in these ways:

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Sources | Medically Reviewed on 04/05/2017 Reviewed by Neha Pathak, MD on April 05, 2017


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U.S. Food and Drug Administration.

Reviewed by Neha Pathak, MD on April 05, 2017

This tool does not provide medical advice. See additional information.

THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.