Fluoroquinolones, including levofloxacin, are associated with disabling and potentially irreversible serious adverse reactions that have occurred together, including tendinitis and tendon rupture, peripheral neuropathy, and CNS effects. Discontinue levofloxacin and avoid use of fluoroquinolones in patients with these serious adverse reactions. Reserve use of levofloxacin for patients with no alternative treatment options for an uncomplicated UTI, acute bacterial exacerbation of chronic bronchitis, or acute bacterial sinusitis. Fluoroquinolones, including levofloxacin, may exacerbate muscle weakness in persons with myasthenia gravis. Avoid in patients with known history of myasthenia gravis .
Medically reviewed on June 7, 2018
Commonly used brand name(s)
In the U.S.
Available Dosage Forms:
Therapeutic Class: Antibiotic
Chemical Class: Fluoroquinolone
Uses For This Medicine
Levofloxacin injection is used to treat bacterial infections in many different parts of the body. It is also used to prevent an anthrax infection after a person has been exposed to anthrax. Levofloxacin is also used to treat and prevent plague (including pneumonic and septicemic plague).
Levofloxacin belongs to the class of medicines known as quinolone antibiotics. It works by killing bacteria or preventing their growth. However, levofloxacin will not work for colds, flu, or other virus infections.
Levofloxacin is to be given only by or under the direct supervision of your doctor.
Before Using This Medicine
In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For levofloxacin, the following should be considered:
Tell your doctor if you have ever had any unusual or allergic reaction to levofloxacin or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.
Use is not recommended for infants, children, or teenagers. However, levofloxacin injection may be used in children 6 months of age and older to treat plague and to prevent an anthrax infection after a possible exposure.
Appropriate studies performed to date have not demonstrated geriatric-specific problems that would limit the usefulness of levofloxacin injection in the elderly. However, elderly patients are more likely to have age-related tendon disorders (including tendon rupture) and kidney, liver, or heart problems, which may require caution and an adjustment in the dose for patients receiving levofloxacin injection.
|All Trimesters||C||Animal studies have shown an adverse effect and there are no adequate studies in pregnant women OR no animal studies have been conducted and there are no adequate studies in pregnant women.|
There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.
Interactions with Medicines
Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are receiving levofloxacin, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
Using levofloxacin with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.
Using levofloxacin with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
- Aripiprazole Lauroxil
- Arsenic Trioxide
- Cholera Vaccine, Live
- Inotuzumab Ozogamicin
- Insulin Aspart, Recombinant
- Insulin Bovine
- Insulin Degludec
- Insulin Detemir
- Insulin Glargine, Recombinant
- Insulin Glulisine
- Insulin Lispro, Recombinant
- Sodium Phosphate
- Sodium Phosphate, Dibasic
- Sodium Phosphate, Monobasic
Using levofloxacin with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
- Aminolevulinic Acid
- Lanthanum Carbonate
Interactions with Food/Tobacco/Alcohol
Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.
Other Medical Problems
The presence of other medical problems may affect the use of levofloxacin. Make sure you tell your doctor if you have any other medical problems, especially:
- Bradycardia (slow heartbeat) or
- Diabetes or
- Diarrhea or
- Heart rhythm problems (eg, prolonged QT interval), or family history of or
- Hypokalemia (low potassium in the blood), uncorrected or
- Liver disease (including hepatitis) or
- Myocardial ischemia (reduced blood supply in the heart) or
- Seizures (epilepsy), or history of—Use with caution. May make these conditions worse.
- Brain disease (eg, hardening of the arteries) or
- Kidney disease, severe or
- Organ transplant (eg, heart, kidney, or lung), history of or
- Tendon disorder (eg, rheumatoid arthritis), history of—Use with caution. May cause side effects to become worse.
- Myasthenia gravis (severe muscle weakness), or history of—Should not be used in patients with this condition.
Proper Use of This Medicine
A nurse or other trained health professional will give you levofloxacin. Levofloxacin is given through a needle placed in one of your veins. The medicine must be injected slowly, so the needle will need to stay in place for at least 1 hour.
Levofloxacin comes with a Medication Guide. It is very important that you read and understand this information. Be sure to ask your doctor about anything you do not understand.
Your doctor will give you a few doses of levofloxacin until your condition improves, and then switch you to an oral medicine that works the same way. If you have any concerns about this, talk to your doctor.
Several additional glasses of water should be taken every day while being treated with levofloxacin, unless otherwise directed by your doctor. Drinking extra water will help to prevent some unwanted effects of levofloxacin.
Precautions While Using This Medicine
It is very important that your doctor check your progress while you are receiving levofloxacin. This will allow your doctor to see if the medicine is working properly and to decide if you should continue to receive it. Blood and urine tests may be needed to check for unwanted effects.
Levofloxacin may rarely cause inflammation (tendinitis) or tearing of a tendon (the cord that attaches muscles to the bones). This can occur while you are receiving the medicine or after you finish using it. The risk of having tendon problems may be increased if you are over 60 years of age, are using steroid medicines (eg, dexamethasone, prednisolone, prednisone, or Medrol®), have severe kidney problems, have a history of tendon problems (eg, rheumatoid arthritis), or have received an organ (eg, heart, kidney, or lung) transplant. Check with your doctor right away if you have sudden pain or swelling in a tendon after exercise (eg, ankle, back of the knee or leg, shoulder, elbow, or wrist), bruise more easily after an injury, or are unable to bear weight or move the affected area. Refrain from exercise until your doctor says otherwise.
Levofloxacin may cause serious allergic reactions, including anaphylaxis, which can be life-threatening and require immediate medical attention. Tell your doctor or nurse right away if you have a rash, itching, hives, hoarseness, lightheadedness or fainting, trouble breathing, trouble swallowing, or any swelling of your hands, face, or mouth after you get the injection.
Serious skin reactions can occur with levofloxacin. Check with your doctor right away if you have blistering, peeling, or loose skin, red skin lesions, severe acne or skin rash, sores or ulcers on the skin, or fever or chills while you are receiving levofloxacin.
Levofloxacin may cause serious liver problems, including hepatitis. Check with your doctor right away if you start having nausea or vomiting, dark urine, light-colored stools, stomach pain, or yellow eyes or skin while you are using levofloxacin.
Levofloxacin may cause diarrhea, and in some cases it can be severe. It may occur 2 months or more after you stop using levofloxacin. Do not take any medicine to treat diarrhea without first checking with your doctor. Diarrhea medicines may make the diarrhea worse or make it last longer. If you have any questions about this or if mild diarrhea continues or gets worse, check with your doctor.
Tell your doctor right away if you start having numbness, tingling, or burning pain in your hands, arms, legs, or feet. These may be symptoms of a condition called peripheral neuropathy.
If you have low blood potassium or an abnormally slow heartbeat, levofloxacin may increase your risk of having a fast, slow, or irregular heartbeat, loss of consciousness, or fainting spells. If these symptoms occur, tell your doctor right away.
Tell your doctor right away if you have any of the following symptoms while using levofloxacin: convulsions, feeling anxious, confused, or depressed, seeing, hearing, or feeling things that are not there, severe headache, trouble sleeping, or unusual thoughts or behaviors.
If you are a diabetic patient taking insulin or diabetes medicine by mouth: Levofloxacin may cause hypoglycemia (low blood sugar) in some patients. Symptoms of low blood sugar must be treated before they lead to unconsciousness (passing out). Different people may feel different symptoms of low blood sugar. If you experience symptoms of low blood sugar, stop using levofloxacin and check with your doctor right away:
- Symptoms of low blood sugar can include: Anxious feeling, behavior change similar to being drunk, blurred vision, cold sweats, confusion, cool pale skin, difficulty with concentrating, drowsiness, excessive hunger, headache, nausea, nervousness, rapid heartbeat, shakiness, or unusual tiredness or weakness.
Some people who use levofloxacin may become more sensitive to sunlight than they are normally. Exposure to sunlight, even for brief periods of time, may cause severe sunburn or skin rash, redness, itching, or discoloration. When you begin using levofloxacin:
- Stay out of direct sunlight, especially between the hours of 10 AM and 3 PM, if possible.
- Wear protective clothing, including a hat and sunglasses.
- Apply a sun block product that has a sun protection factor (SPF) of at least 15. Some people may require a product with a higher SPF number, especially if they have a fair complexion. If you have any questions about this, check with your doctor.
- Do not use a sun lamp or tanning bed or booth.
If you have a severe reaction from the sun, check with your doctor.
Levofloxacin may cause some people to become dizzy, lightheaded, drowsy, or less alert than they are normally. Make sure you know how you react to levofloxacin before you drive, use machines, or do anything else that could be dangerous if you are dizzy or not alert. If these reactions are especially bothersome, check with your doctor.
Before you have any medical tests, tell the medical doctor in charge that you are using levofloxacin. The results of some tests may be affected by levofloxacin.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.
This Medicine Side Effects
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor or nurse immediately if any of the following side effects occur:
- Abdominal or stomach cramps or pain (severe)
- bleeding, discoloration of the skin, infection, inflammation, lumps, pain, redness, soreness, swelling, tenderness, or warmth at the injection site
- diarrhea (watery and severe) which may also be bloody
- feeling that others can hear your thoughts or control your behavior
- pain, inflammation, or swelling in the calves of the legs, shoulders, or hands
- redness and swelling of the skin
- seeing, hearing, or feeling things that are not there
- sensation of burning on the skin
- severe mood or mental changes
- skin rash, itching, or redness
- unusual behavior
Incidence not known
- Black, tarry stools
- burning, numbness, tingling, or painful sensations
- change in vision
- dark-colored urine
- difficulty with breathing
- difficulty with chewing, talking, or swallowing
- fast or irregular heartbeat
- general body swelling
- joint or muscle pain
- muscle cramps, spasms, pain, or stiffness
- peeling or loosening of the skin
- puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
- severe dizziness
- severe tiredness
- tightness in the chest
- unsteadiness or awkwardness
- unusual bleeding or bruising
- unusual tiredness or weakness
- voice changes
- weakness in the arms, hands, legs, or feet
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
- Abdominal or stomach pain or discomfort
- change in taste
- trouble sleeping
- vaginal itching and discharge
Incidence not known
- Feeling faint
- feeling of warmth or heat
- flushing or redness of the skin, especially on the face and neck
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
See also: Side effects (in more detail)
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
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- Drug class: quinolones
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Other brands: Levaquin