Med of the Month: Ciprofloxacin

Our recent Med of the Month feature on levofloxacin sparked a surprising amount of interest and conversation among dental providers, particularly around fluoroquinolones and their growing list of warnings. Based on that response, we thought it would be helpful to take a closer look at another medication in the same class that appears more often in dental prescribing conversations or on patient medication lists: ciprofloxacin.

While ciprofloxacin is a powerful antibiotic, it also carries significant risks that make thoughtful prescribing essential. In dentistry, this medication is less about routine use and more about understanding when caution, alternatives, or collaboration with a patient’s medical team are warranted.

Generic Name: Ciprofloxacin

Brand Name(s): Cipro, Cipro XR

Pronunciation: SIP roe FLOX a sin

About this drug:

• Ciprofloxacin is a quinolone antibiotic used to treat various types of bacterial infections, anthrax, and the plague.

Dentistry-related tidbits:

• If treating a patient taking ciprofloxacin:

  • Monitor blood pressure and heart rate when administering lidocaine (Xylocaine) to a patient taking ciprofloxacin, as the combination may increase the risk of hypotension and bradycardia. Risk may be higher with continuous infusion or high anesthetic doses.

  • Exercise caution when administering ropivacaine (Naropin) to a patient taking ciprofloxacin, as the combination may increase ropivacaine levels and risk of side effects.

  • Check with the cardiologist before giving epinephrine if the patient has an irregular heartbeat to avoid an increased risk of cardiac arrhythmias and QT prolongation.

• If prescribing ciprofloxacin, keep the following in mind:

  • If your patient is pregnant or breastfeeding, consult their obstetrician before prescribing.

  • Ciprofloxacin may decrease the efficacy of hormonal contraceptives (e.g. pills, implants, some IUDs). Recommend a backup non-hormonal birth control method to patients taking hormonal birth control, such as condoms or diaphragm with spermicide.

  • Advise patients to seek medical help immediately if they notice signs of a serious allergic reaction, including rash, itching, swelling (especially of the face, tongue, or throat), severe dizziness, or trouble breathing.

  • Dairy products may also affect the absorption of ciprofloxacin. Instruct patients to not take their medication with milk or other dairy products and to take the medication at least 2 hours before or 6 hours after calcium-containing products.

  • Advise the patient to drink lots of water or other fluids while taking ciprofloxacin.

  • Considerations for elderly patients:

    • Exercise caution or use an alternative antibiotic in patients over 60 years of age. Ciprofloxacin is associated with serious and potentially irreversible adverse effects.

    • Elderly patients may be more susceptible to QT prolongation, especially if they are also taking anti-arrhythmic medications.

• The most common side effects of ciprofloxacin include diarrhea, nausea, vomiting, skin rashes, sun sensitivity, and changes in liver enzyme levels. In rare instances, Ciprofloxacin may cause severe damage to the aorta which may lead to serious bleeding or death. The medication may also cause changes in mood or behavior.

• Ciprofloxacin carries FDA warnings for disabling and potentially irreversible serious adverse reactions, including:

  • Tendinitis and tendon rupture

  • Peripheral neuropathy

  • Central nervous system effects

• Ciprofloxacin should only be used in patients who have no alternative treatment options for the following indications:

  • Acute exacerbation of chronic bronchitis

  • Acute uncomplicated cystitis

  • Acute sinusitis (Dentists may occasionally prescribe for sinusitis due to proximity to oral infections; however, sinus infections are often more difficult to treat and typically require longer treatment durations.)

• This medication may increase muscle weakness. Do not use if patients have a condition called Myasthenia Gravis.

Staying Safe: important interactions to be aware of

• Using a tool like MedAssent DDS Rx Check can help support safe prescribing. Important interactions include:

  • Caffeine products taken with ciprofloxacin may increase the risk of nervousness, sleeplessness, anxiety, and heart pounding.

  • Prescribing a steroid in combination with ciprofloxacin may increase the risk of a tendon rupture.

  • NSAIDs, aspirin, and aspirin-containing products combined with ciprofloxacin may increase the risk of CNS stimulation and seizures.

  • The muscle relaxant tizanidine should not be used with ciprofloxacin, as the combination may increase tizanidine levels and increase risk of bradycardia, diminished psychomotor function, CNS depression, and hypotension, including orthostasis and syncope.

Fun facts:

• Ciprofloxacin works by interfering with two bacterial enzymes (DNA gyrase and topoisomerase IV) that are essential for bacterial DNA replication and transcription. (If any readers are avid musical theater fans, you might appreciate that one of the most interesting reviews of ciprofloxacin, titled Wicked: The Untold Story of Ciprofloxacin, uses the idea of a “wicked problem” - popularized in systems thinking and famously referenced in the musical Wicked - to explore antibiotic resistance, making for a fun and insightful interdisciplinary read.)

• Ciprofloxacin remains one of the most commonly prescribed antibiotics worldwide because of its broad-spectrum coverage. That same breadth, however, makes rising antibiotic resistance especially concerning. As resistance increases, clinicians lose an important “backup” option for treating serious infections, which is why current guidelines emphasize reserving ciprofloxacin for situations where safer alternatives are not appropriate.

Get more dental-specific drug information with the Digital Drug Handbook (web) or BrushUp Rx (mobile app).