FAQs About Cipro

Antibiotics are among the most important medical discoveries in human history. The advent of antibiotics during the 20th century revolutionized modern medicine and led to the quick treatment of infections that were once considered deadly. But rampant overuse of the revolutionary medicine has led to antibiotic-resistant superbugs; and overuse of one of the most popular antibiotics in the past two decades has exposed thousands of people to serious potential side effects associated with the drug, including damage to the aorta, the body’s main artery.

What is Cipro?

Cipro is the brand-name of a popular prescription antibiotic medication used to treat common bacterial infections. The main ingredient in Cipro, ciprofloxacin, belongs to a class of drugs called fluoroquinolones. Cipro and other fluoroquinolones are among the most-prescribed antibiotic medicines in the United States, with over 26 million people prescribed one of six currently available fluoroquinolones annually.

What is Cipro used to treat?

Cipro is prescribed to treat many common ailments, including sinus infections, ear infections, bronchitis, pneumonia and urinary tract infections (UTIs). Like all antibiotics, Cipro is only effective in treating bacterial infections. Illnesses such as the common cold, the flu and other infections caused by viruses cannot be cured with antibiotics.

How does Cipro work?

Cipro’s main ingredient, ciprofloxacin, works by targeting certain enzymes within bacteria cells necessary in the DNA replication process. Cipro inhibits the enzymes DNA gyrase and topoisomerase IV, which aid in DNA replication and make cell division possible. Interfering with these enzymes interferes with the bacteria’s ability to survive.

Bacteria are classified as either gram-positive or gram-negative bacteria. Gram-positive bacteria lack an outer membrane and are more susceptible to antibiotics. Cipro’s mechanism of action (MOA) is such that it is active against both gram-positive and gram-negative bacteria. This means Cipro is effective in treating many different types of infections.

Despite its effectiveness in killing bacteria, overuse of Cipro can lead to bacterial resistance. When bacteria become resistant to Cipro, the drug becomes less effective. Resistance to Cipro and other fluoroquinolone antibiotics can evolve rapidly.

Who makes Cipro?

Cipro is manufactured by pharmaceutical giant Bayer Healthcare. Bayer is one of the largest pharmaceutical companies in the world, bringing in over €46.3 billion (about $50.6 billion) in global sales in 2015.

When was Cipro approved by the FDA?

Cipro was approved by the Food and Drug Administration (FDA) on October 22, 1987.

The antibiotic drug was originally approved to treat lower respiratory infections, skin infections, bone and joint infections, infectious diarrhea and urinary tract infections (sometimes called bladder infections).

Its use was later expanded to include the treatment of Typhoid fever, gonorrhea, prostate infections, abdominal infections and infections caused by anthrax, among others. It is also approved to treat complicated urinary tract and kidney infections in children younger than 18 years of age.

What other fluoroquinolone antibiotics are available?

There are six fluoroquinolone antibiotics available on the US market today, including:

  • Avelox (moxifloxacin)
  • Factive (gemifloxacin)
  • Levaquin (levofloxacin)
  • Cipro (ciprofloxacin)
  • Cipro extended release
  • Moxifloxacin injection
  • Ofloxacin

What are the possible side effects of Cipro?

Cipro carries the risk of certain side effects, some of which can be serious and life-threatening. Cipro carries a black box warning on its label regarding some of the possible adverse effects, including the risk of tendonitis and tendon rupture.

According to the drug’s label, the most common side effects of Cipro include:

  • Nausea
  • Diarrhea
  • Vomiting
  • Rash
  • Changes in liver function tests

Other side effects are also possible, including more serious side effects such as:

  • Tendonitis and tendon rupture
  • Nerve damage called peripheral neuropathy
  • Liver damage (hepatoxicity)
  • Central nervous system effects, including seizures and persistent headaches
  • Intestine infections (Pseudomembranous colitis)
  • Serious heart rhythm changes
  • Joint problems in children, including joint damage and joint pain

Some of these side effects can occur immediately after taking the first dose of Cipro, including central nervous system effects, while others can occur months after taking the drug, including tendonitis and tendon rupture.

What is an aortic aneurysm?

Aortic aneurysm is a potentially life-threatening side effect of Cipro and can be life-threatening if not treated right away.

An aortic aneurysm is an abnormal bulge in the wall of the aorta, the body’s main artery responsible for carrying oxygenated blood to all parts of the body except the lungs. When a weak area in the aorta exists, it can allow the pressure within the artery to push outward and create a bulge or ballooned area.

When an aneurysm ruptures it is considered a catastrophic, life-threatening event.

Aneurysms can occur in any blood vessel in the body, but most often occur in the aorta. The two most common areas in the aorta to form an aneurysm are in the abdomen and the chest cavity. Aneurysms put people at risk for:

  • Plaque formation in the artery at the site of the aneurysm
  • Blood clots
  • Increased size of aneurysm, causing it to press on another organ causing pain
  • Rupture, due to weakening of the artery walls


Aortic aneurysms are not often accompanied by symptoms. When they are present, symptoms can include:

  • Tearing pain in the chest, abdomen, or middle of the back between the shoulder blades
  • Aneurysms in the chest cavity can cause shortness of breath, hoarseness, cough and difficulty swallowing
  • A rupture can cause loss of consciousness, stroke, shock or heart attack

What is an aortic dissection?

Aortic dissection is a possible side effect of Cipro and can be fatal if not treated promptly.

Aortic dissection is a rare, but often fatal condition that occurs when the inner lining of the aorta tears. When it tears, blood surges through the opening, causing the inner and middle layers of the aorta to separate, or dissect. If the dissection ruptures, it can be fatal.


Symptoms of aortic dissection can mimic those of other diseases. This can often delay diagnosis. An aortic dissection that is caught early and treated promptly significantly improves a person’s chances of survival.

Symptoms of an aortic dissection include:

  • Sudden, severe chest or upper back pain
  • Loss of consciousness
  • Shortness of breath
  • Sudden difficulty speaking, loss of vision, weakness or paralysis on one side of the body
  • Weak pulse in one arm compared to the other

How does Cipro cause damage to the aorta?

Cipro has been linked to two types of damages to the aorta: aneurysm and dissection. Researchers suggest Cipro may affect collagen composition in the body. Collagen makes up the majority of the lining of the aorta.

Two recent studies published in the November 2015 editions of JAMA Internal Medicine and BMJ linked Levaquin to these risks.

JAMA study

The JAMA Internal Medicine study found patients taking Cipro, or another fluoroquinolone antibiotic, in the last 60 days were at a two-fold increased risk for aortic aneurysm or dissection.

Patients taking the antibiotics in the past 61 days to one year were also at an increased risk, though their risk was slightly lower than current users.

BMJ study

The BMJ study found patients taking Cipro, or other fluoroquinolone antibiotics, were at a nearly three-fold increased risk of aortic aneurysm or dissection.

The study, which looked at 1.7 million older adults, said most patients who developed an aortic aneurysm or dissection did so after about 20 days of taking the medication.

The study also talked about the overprescribing of antibiotics in the United States, which can be especially dangerous when those antibiotics carry risks of serious side effects.

According to the study authors, “reducing unnecessary fluoroquinolone treatments or prolonged treatment courses might have possibly prevented more than 200 aortic aneurysms in this population.”

Has the FDA issued any warnings about Cipro?

The FDA has issued numerous warnings about Cipro since it was first approved in the late 1980s. Most of the warnings are in regard to the drug’s possible side effects, some of which can be serious and lead to death.

Black box warnings

In 2008, the FDA required the makers of Cipro and other fluoroquinolone antibiotics to include a black box warning on the drugs’ labels, warning patients of the risk of tendonitis and tendon rupture.

Cipro increases a person’s risk for tendon damage or rupture. While this can affect any tendon in the body, it most often occurs in the Achilles tendon.

The agency said the risk for tendon damage or rupture can affect anyone taking Cipro, but the risk is greater for those over 60, who are using steroidal medications, or who have had a lung, kidney or heart transplant.

Symptoms of a damaged or ruptured tendon include:

  • Pain, swelling or inflammation
  • A snap or pop in the tendon area
  • Bruising right after injury in a tendon area
  • Inability to move the affected area or bear weight

Cipro’s black box warning also includes the risk of exacerbated muscle weakness in people with myasthenia gravis, a condition that affects the communication between nerves and muscles.

Peripheral neuropathy

In 2013, the FDA issued a safety communication regarding the risk of peripheral neuropathy while taking Cipro and other fluoroquinolones.

Peripheral neuropathy is severe nerve damage occurring in the arms or legs. The agency warned it could occur at any time while taking Cipro and could last for days or months after stopping the medication. For some people the symptoms could be permanent, the agency would later warn.

Symptoms of peripheral neuropathy include:

  • Pain
  • Burning
  • Tingling
  • Numbness
  • Weakness
  • Change in sensation to light touch, pain or temperature, of sense of body position

Cipro’s benefits don’t outweigh risks

Recently, in May 2016, the FDA issued a warning about Cipro and other fluoroquinolones saying the drugs’ serious side effects do not usually outweigh the benefits for patients being treated for uncomplicated UTIs, sinus infections and bronchitis.

The agency’s safety communication warned fluoroquinolones, including Cipro, are “associated with disabling and potentially permanent serious side effects that can occur together. These side effects involve the tendons, muscles, joints, nerves and central nervous system.

The agency said people being treated for the common illnesses mentioned above should not take Cipro or any other fluoroquinolone unless no other treatment option is available.

Cipro’s black box warning will soon be updated to include this new warning.

Has Cipro been recalled?

Cipro has not been recalled by the FDA in regard to its possible serious side effects.

Ciprofloxacin, the generic version of Cipro, has been involved in at least one recall involving tainted batches of the antibiotic drug, including a 2010 recall of intravenous ciprofloxacin.

Are there generic versions of Cipro available?

Cipro is available as a generic sold under the generic name ciprofloxacin. Generics are generally cheaper than their brand-name counterparts, and can be sold through various different pharmaceutical companies.

How do you take Cipro?

Cipro can be taken orally or given intravenously (IV). Cipro is usually given intravenously in a hospital setting.

When taken orally, Cipro is available in 250 mg and 500 mg pills and as a 5% or 10% liquid suspension. The dosage usually depends on the infection being treated and the patient’s age.

Renal dosing: Patients with kidney problems, including kidney failure, may be given a lower dose of Cipro.

Cipro can be taken with or without food, but dairy products and calcium-fortified juices should be avoided unless they are part of a whole meal.


Reversible renal (kidney) toxicity has been reported in acute overdoses of Cipro. Seek emergency medical help or call the Poison Help line at 1-800-222-1222 immediately after a suspected Cipro overdose.

What should I avoid while taking Cipro?

Cipro is contraindicated in people taking the muscle relaxant tizanidine (sold under the brand name Zanaflex) or who have an allergy to Cipro or any member of the quinolone class of antibiotics.

Cipro can also interact with certain drugs and vitamins and minerals.

Foods to avoid

Dairy products – You should not take Cipro with dairy products or calcium-fortified foods alone, as they may make Cipro less effective. Dairy products, such as milk, cheese and yogurt, and calcium-fortified juices may be taken with Cipro if part of a whole meal, but do not take them alone with Cipro.

Caffeine – Avoid taking food or drugs containing caffeine as Cipro may make the effects of caffeine stronger.

Supplements/products to avoid

Antacids – Antacids that contain magnesium or aluminum, such as Maalox, Mylanta and Rolaids, and the ulcer medicine sucralfate (Carafate) should be taken at least two hours before or six hours after taking Cipro.

Vitamins or mineral supplements – Vitamins or mineral supplements that contain calcium, iron or zinc should be taken at least two hours before or six hours after taking Cipro.

Didanosine (Videx) powder or chewable tablets should be taken at least two hours before or six hours after taking Cipro.

Other things to avoid

Sunlight or tanning beds – Cipro may make your skin burn more easily.

Driving – Cipro can impair your thinking and reactions. It is important to be careful if you drive or do anything that requires you to be alert.

Other possible interactions

Birth control – Some antibiotics can interact with certain forms of birth control (contraception) and may make them less effective, raising a person’s risk for unintended pregnancy. Cipro is not usually associated with this kind of effect on birth control.

Who should not take Cipro?

Cipro is not safe to use in all patients. The following patients may want to avoid taking Cipro or speak with their doctor before taking the medication.

Patients with myasthenia gravis – People with a muscle disorder known as myasthenia gravis should not take Cipro as it can exacerbate muscle weakness.

Pregnant women – Cipro is a pregnancy category C drug, meaning there are no adequate and well-controlled studies in pregnant women to show it is safe to use during pregnancy. Women who are pregnant should speak with their doctor before taking Cipro to see if the drug’s benefits outweigh the possible risks.

Nursing mothers – Cipro can pass through breast milk from mother to baby. Because of the drug’s possible side effects, a decision should be made whether or not to continue breastfeeding or taking Cipro based on the mother’s need for the drug.

Children – Cipro should not be the drug of first choice in pediatric patients (children and adolescents) because of its risk of serious side effects.

Are there lawsuits against the maker of Cipro?

Previous class action and individual lawsuits have been filed against the makers of some fluoroquinolone antibiotics due to the drugs’ possible side effects of tendon rupture and peripheral neuropathy.

With recent studies linking the antibiotic medications, including Cipro, to aortic aneurysms and dissections, new lawsuits are being filed in 2016 by those harmed by the popular drugs.

As of July 2016, no settlements have been reached in any Cipro Aortic Aneurysm Lawsuit.

I took Cipro and suffered an aortic aneurysm. Can I file a lawsuit?

National Injury Help is currently investigating cases for a potential lawsuit against the makers of Cipro, pharmaceutical giant Bayer Healthcare.

Other lawsuits are possibly forming against the makers of other popular fluoroquinolone antibiotics, including Levaquin.

If you or someone you love took Cipro and suffered from an aortic aneurysm or dissection, you may be entitled to financial compensation. Not sure if you have a case? Call us today to speak with a member of our legal team. We can answer your questions and help you determine if your case qualifies for a possible lawsuit.

Call National Injury Help today at 1-800-214-1010, or use the form on the right hand side of your screen.