Levofloxacin is a powerful fluoroquinolone antibiotic prescribed to combat a variety of bacterial infections in adults and, in some cases, children. While effective, it can also lead to serious side effects, including skin reactions. This guide provides a comprehensive overview of levofloxacin, its uses, potential side effects, and crucial precautions.
What is Levofloxacin?
Levofloxacin is a synthetic chemotherapeutic antibiotic of the fluoroquinolone class. It is used to treat a range of bacterial infections, including:
- Nosocomial pneumonia
- Community-acquired pneumonia
- Acute sinus infection
- Acute worsening of chronic bronchitis
- Skin infections (complicated and uncomplicated)
- Chronic prostate infection
- Urinary tract infections (complicated and uncomplicated)
- Acute kidney infection (pyelonephritis)
- Inhalation anthrax
- Plague
For certain conditions like plague and anthrax, studies were conducted in animals as these infections cannot be ethically studied in humans. Levofloxacin is generally not recommended for uncomplicated urinary tract infections, acute bacterial exacerbations of chronic bronchitis, or acute bacterial sinusitis if alternative treatment options exist.
In children aged 6 months and older, levofloxacin may be used to treat or prevent anthrax or plague exposure. Its safety and effectiveness in children under 6 months, or for treatment durations exceeding 14 days, are not established.
How Levofloxacin Works
Levofloxacin kills bacteria by interfering with their ability to create and repair their DNA. This mechanism effectively halts bacterial growth and replication.
Dosage Forms and Storage
Levofloxacin is available in several forms:
- Oral tablets (250 mg, 500 mg, 750 mg)
- Oral solution (25 mg/mL)
- Injectable form for intravenous use
Oral tablets and liquid should be stored at room temperature (68°F to 77°F or 20°C to 25°C), with temporary exposure to temperatures between 59°F and 86°F (15°C to 30°C) acceptable. It should be kept in a cool, dry place. The injectable form is administered by healthcare professionals and typically not stored at home.
Important Warnings and Precautions
Levofloxacin can cause serious side effects, some of which can be life-threatening. It is crucial to seek immediate medical attention if any of the following occur:
1. Tendon Rupture or Inflammation (Tendinitis)
Tendon problems, including pain, swelling, tears, and rupture, can occur in people of all ages taking levofloxacin. The risk is higher for individuals over 60, those taking steroid medications, or those who have had a kidney, heart, or lung transplant. However, tendon problems can occur even without these risk factors. Physical activity, kidney failure, and a history of tendon problems can also increase the risk.
Seek immediate medical help if you experience any of the following:
- Pain, swelling, or inflammation of a tendon.
- A snap or pop in a tendon area.
- Bruising right after an injury in a tendon area.
- Inability to move the affected area or bear weight.
Avoid exercise and using the affected limb until advised by a healthcare provider. The Achilles tendon at the back of the ankle is most commonly affected, but other tendons can also be involved. Tendon rupture can occur during treatment or up to several months after finishing levofloxacin.
2. Nerve Damage (Peripheral Neuropathy)
Damage to the nerves in the arms, hands, legs, or feet can occur with levofloxacin use. This nerve damage may be permanent.
Stop taking levofloxacin immediately and contact your healthcare provider if you experience symptoms such as:
- Pain
- Burning
- Tingling
- Numbness
- Weakness in your extremities
3. Central Nervous System (CNS) Effects
Levofloxacin can affect the central nervous system, potentially leading to seizures, hallucinations, confusion, depression, and suicidal thoughts.
Seek immediate medical help if you experience any of the following:
- Seizures
- Hallucinations (seeing, hearing, or sensing things that are not there)
- Restlessness, tremors, anxiety, or nervousness
- Confusion or depression
- Trouble sleeping or nightmares
- Lightheadedness or dizziness
- Increased suspicion (paranoia)
- Suicidal thoughts or actions
- Headaches that do not go away, with or without blurred vision
Inform your healthcare provider about any history of seizures before starting levofloxacin.
4. Worsening of Myasthenia Gravis
Levofloxacin can exacerbate symptoms in individuals with myasthenia gravis, a condition causing muscle weakness. This can lead to severe breathing difficulties or even death.
If you have a history of myasthenia gravis, inform your healthcare provider. Call your provider immediately if you experience worsening muscle weakness or breathing problems.
5. Serious Allergic Reactions
Allergic reactions can occur even after a single dose of levofloxacin. Symptoms can range from skin rashes to severe anaphylaxis.
Seek emergency medical help immediately if you develop:
- Hives
- Trouble breathing or swallowing
- Swelling of the lips, tongue, or face
- Throat tightness or hoarseness
- Rapid heartbeat
- Fainting
- Skin rash
6. Liver Damage (Hepatotoxicity)
Levofloxacin can cause liver damage. Call your healthcare provider right away if you notice unexplained symptoms such as nausea, vomiting, stomach pain, fever, weakness, itching, unusual tiredness, loss of appetite, light-colored bowel movements, dark-colored urine, or yellowing of the skin or whites of the eyes.
7. Aortic Aneurysm and Dissection
Levofloxacin use may be associated with an increased risk of aortic aneurysm and dissection. Tell your healthcare provider if you have a history of these conditions. Seek emergency medical help immediately for sudden chest, stomach, or back pain.
8. Intestine Infection (Pseudomembranous Colitis)
This condition, caused by an overgrowth of bacteria, can occur with many antibiotics, including levofloxacin. It can develop up to two months after finishing the medication.
Call your healthcare provider immediately if you experience:
- Watery diarrhea or diarrhea that doesn't go away
- Bloody stools
- Stomach cramps and fever
Do not take anti-diarrheal medication without consulting your doctor, as it may worsen the condition.
9. Serious Heart Rhythm Changes (QT Prolongation)
Levofloxacin can cause a rare but dangerous heart rhythm problem. The risk is higher in the elderly, those with a family history of prolonged QT interval, low blood potassium, or those taking certain heart rhythm medications.
Tell your healthcare provider right away if you faint or experience a change in your heart rate (fast, irregular, or skipping beats).
10. Changes in Blood Sugar
Levofloxacin can cause both low blood sugar (hypoglycemia) and high blood sugar (hyperglycemia), especially when taken with diabetes medications or insulin. Monitor your blood sugar as directed by your healthcare provider. Stop levofloxacin and call your provider immediately if you experience symptoms of hypoglycemia.
11. Sensitivity to Sunlight (Photosensitivity)
Levofloxacin can make your skin more sensitive to sunlight and artificial UV light. This can lead to severe sunburn, blisters, or swelling.
While taking levofloxacin:
- Avoid sunlamps and tanning beds.
- Limit your time in the sun.
- Use sunscreen with a high SPF.
- Wear protective clothing, including a hat and sunglasses.
Call your healthcare provider immediately if you experience a severe skin reaction to sunlight.
Who Should Not Take Levofloxacin?
Do not take levofloxacin if you have a history of severe allergic reactions to fluoroquinolone antibiotics or if you are allergic to levofloxacin itself or any of its ingredients.
Interactions with Food and Other Medicines
Food and Drink
When taking levofloxacin oral solution, take it one hour before or two hours after eating. While alcohol is not known to interact with levofloxacin, excessive alcohol consumption can weaken your immune system.
Drug Interactions
Levofloxacin can interact with numerous medications. It is crucial to inform your healthcare provider about all medications, vitamins, and supplements you are taking. Key interactions include:
- Antacids, Multivitamins, and Supplements containing magnesium, aluminum, zinc, or iron: Take levofloxacin at least 2 hours before or after these products.
- Steroid medicines
- Anti-psychotic medicines
- Tricyclic antidepressants
- Diuretics (water pills)
- Blood thinners (e.g., warfarin)
- Oral anti-diabetes medicines or insulin
- NSAIDs (Non-Steroidal Anti-Inflammatory Drugs): Taking NSAIDs with levofloxacin can increase the risk of CNS effects and seizures.
- Theophylline
- Medicines to control heart rate or rhythm (antiarrhythmics)
- Sucralfate
Levofloxacin may also affect the results of urine tests for opiates. Inform your healthcare provider if you are taking levofloxacin before undergoing such testing.
Taking Levofloxacin
Take levofloxacin exactly as prescribed by your healthcare provider, at the same time each day. Drink plenty of fluids while taking the medication.
If you miss a dose, take it as soon as you remember, but do not take more than one dose in a day. Levofloxacin for injection is given intravenously over 60 or 90 minutes.
Do not stop taking levofloxacin prematurely, even if you feel better, unless advised by your doctor due to serious side effects. Completing the full course of treatment is essential to kill all bacteria and prevent antibiotic resistance.
If your infection does not improve, contact your healthcare provider. If it persists, the bacteria may have become resistant to levofloxacin, potentially making it ineffective for future infections.
In case of an overdose, contact your healthcare provider or seek immediate medical help.
What to Avoid While Taking Levofloxacin
Levofloxacin can cause dizziness and lightheadedness. Avoid driving, operating machinery, or engaging in activities requiring mental alertness until you know how the medication affects you.
As mentioned earlier, avoid excessive sun exposure and tanning beds due to photosensitivity risks.
Other Potential Side Effects
Common side effects of levofloxacin include:
- Nausea
- Headache
- Diarrhea
- Insomnia (trouble sleeping)
- Constipation
- Dizziness
In children treated for anthrax or plague, vomiting may also be common.
Low blood pressure can occur if levofloxacin injection is administered too quickly. Inform your healthcare provider if you feel dizzy or faint during infusion.