Flevox

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Medically reviewed

Laura Arias

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Flevox

Property Description
Active ingredient Levofloxacin
Form Tablet, Oral Solution, Intravenous (IV) Injection, Ophthalmic Drops
Pharmacological class Fluoroquinolone Antibacterial (Third-Generation)
Common use Systemic treatment of serious bacterial infections
Origin Synthetic Compound

What Type of Antibiotic is Levofloxacin?

Flevox is a trade name for the powerful Levofloxacin, a fully synthetic antibiotic designed for systemic action throughout the body. The drug is classified as a fluoroquinolone antibacterial, a family of agents widely recognized for high potency against a broad spectrum of bacterial pathogens. Levofloxacin is considered a third-generation fluoroquinolone; the drug possesses high bioavailability, meaning it is nearly completely absorbed after oral administration, allowing for reliable systemic delivery.

Composition, Forms, and Origin of the Drug

The pharmacological activity of Flevox is concentrated in its single active component, Levofloxacin, which is the pure S-(-) enantiomer of the older compound Ofloxacin. Being a synthetic compound, it is fully manufactured through chemical processes, ensuring precise purity and consistency. The drug is available in multiple forms, including oral tablets and solutions, sterile solutions for intravenous (IV) injection for rapid systemic delivery, and localized ophthalmic drops for eye infections.

The Core Purpose: How Does Flevox Provide Benefit?

The fundamental purpose of Flevox is to resolve infections through definitive bactericidal action, meaning the drug actively kills the causative bacteria. It achieves this by disrupting essential bacterial enzymes, specifically DNA gyrase and topoisomerase IV. Due to its advanced profile, Levofloxacin is clinically recognized for its improved activity against Gram-positive bacteria, particularly those involved in serious respiratory tract infections, positioning it as a key tool in managing moderate-to-severe bacterial disease.

What side effects are possible with Flevox?

Possible Side Effects and Safety Information

The safety profile of Flevox (Levofloxacin) is classified by regulatory authorities based on the frequency and system-organ class affected. Adverse reactions are grouped into frequency categories such as Common (e.g., nausea, headache, diarrhea, insomnia) and Rare (e.g., tendinitis), reflecting incidence rates from clinical studies.


Serious Adverse Reactions and Safety Constraints

Official prescribing information highlights the risk of disabling and potentially irreversible serious adverse reactions that affect multiple body systems. These include tendinitis and tendon rupture, peripheral neuropathy (nerve damage), and significant Central Nervous System (CNS) effects. Other serious documented concerns include Aortic Aneurysm and Dissection, severe hepatotoxicity, and Exacerbation of Myasthenia Gravis.

This medication is reserved for use only in patients who have no alternative treatment options for certain infections, such as uncomplicated urinary tract infections, due to the risk of these serious reactions.


Time-Related and Population-Specific Safety Notes

The onset of serious effects like tendon issues may occur as early as within 48 hours of starting treatment or up to several months after discontinuation. Psychiatric adverse reactions and allergic reactions may also occur following the first dose.

Risk for certain adverse reactions is officially noted to be increased in specific patient groups. These include older adults (increased risk of tendon and aortic issues), patients with renal impairment, and those with solid organ transplants. Co-administration with corticosteroids is officially noted to increase the risk of tendon rupture.

Overdose and Emergency Response

Overdose Manifestations and Severe Outcomes

Official regulatory documents specify that overdose of Flevox (Levofloxacin) primarily affects the Central Nervous System (CNS) and the cardiovascular system.

Documented overdose signs and symptoms include CNS effects such as dizziness, confusion, tremors, and the potential for convulsive seizures. Gastrointestinal reactions, including nausea, may also be observed.

A severe physiological finding associated with overdose is QT interval prolongation on an electrocardiogram. This finding carries a documented risk of torsade de pointes, a specific, life-threatening ventricular arrhythmia, mandating immediate clinical attention.

Immediate Action and Management

Category Official Regulatory Statement
When to Seek Help Seek immediate medical attention or contact a poison control center for any suspected overdose. Urgent help is required for the occurrence of any overdose symptoms.
Antidote Status No specific antidote is known for Levofloxacin overdose.
Supportive Treatment Treatment involves symptomatic and supportive treatment. Procedures such as gastric evacuation (e.g., gastric lavage) and administration of activated charcoal may be considered in recent cases.
Monitoring Requirement Continuous Electrocardiogram (ECG) monitoring is required due to the risk of QT prolongation. Adequate hydration must be maintained to mitigate the potential for crystalluria.

Therapeutic Uses of Flevox

Flevox (Levofloxacin) is commonly used in the management of serious bacterial infections that present with moderate-to-severe symptomatic discomfort. The medication is considered relevant across domains where additional symptomatic support is needed due to the heightened systemic burden of the disease.

It is commonly used across conditions presenting with acute episodes in the respiratory, urogenital, and skin domains. Relevant conditions include community-acquired pneumonia (CAP), acute bacterial exacerbations of chronic bronchitis, complicated urinary tract infections (cUTI), and acute pyelonephritis (kidney infection). It is also considered relevant for complicated skin and soft tissue infections and in critical public health contexts for treating inhalational anthrax and plague.

The drug is applied during phases when symptoms become more noticeable, helping to address symptoms that interfere with daily functioning like high fever, difficulty breathing, and intense localized pain. This therapeutic approach supports the patient during difficult episodes by assisting with symptom management and contributes to easing the overall symptom load.


“Flevox is used in clinical settings that involve acute or unstable symptom patterns, supporting patients during episodes of heightened discomfort.”

Quick Fact: Therapeutic Focus: Systemic Discomfort Flevox is relevant in contexts involving heightened systemic burden, supports the management of pronounced symptoms such as high fever and chills associated with serious bacterial disease.

Eligibility and Restrictions for Use

Flevox (Levofloxacin) eligibility is strictly defined by regulatory authorities based on population status and clinical history. The medicine is absolutely contraindicated in several groups. Patients must not use Flevox if they have a known allergy to levofloxacin or any other fluoroquinolone antibacterial. Use is also prohibited for individuals with a history of Myasthenia Gravis, epilepsy, or prior tendon disorders linked to any fluoroquinolone.

Eligibility for systemic use is largely restricted by age. The medicine is primarily approved for adults (18 years and older). For children and adolescents, systemic use for routine infections is generally contraindicated or reserved. It is only permitted for pediatric patients (starting at six months of age) when treating specific, life-threatening conditions such as Inhalational Anthrax and Plague. Furthermore, Flevox is contraindicated or not recommended for women who are pregnant or breastfeeding.

Conditional use is outlined for several populations. Patients with impaired kidney function require dosage adjustment as mandated by official labeling. Flevox must also be used with caution in individuals at risk for seizures or with risk factors for QT interval prolongation.

What should I know about interactions with other medicines?

Flevox Interactions with other medicines and products

The interaction profile of Flevox (Levofloxacin) is primarily defined by two regulatory constraints: interactions that reduce absorption and interactions that create an additive risk.

Official Pharmacokinetic Constraints

Interacting Product Category Official Constraint/Outcome
Multivalent Cation-Containing Products (e.g., antacids, iron salts, zinc salts, Sucralfate, buffered Didanosine) Reduced Exposure: Levofloxacin absorption is significantly decreased due to chelation [Source 1.4]. Oral Levofloxacin must be administered at least two hours before or two hours after these products [Source 2.3]. The intravenous formulation must not be co-administered in the same IV line with a multivalent cation [Source 1.4].
Renal Tubular Blockers (e.g., Probenecid, Cimetidine) Reduced Clearance: These agents reduce Levofloxacin renal clearance by blocking tubular secretion [Source 4.2]. Caution is advised, especially in renally impaired patients [Source 1.4].

Official Pharmacodynamic Interactions

Co-administration with other medicines may lead to additive effects, requiring close monitoring:

  • Warfarin: Levofloxacin can enhance the anticoagulant effect, necessitating monitoring of prothrombin time and INR [Source 1.4, 3.2].
  • QT-prolonging Drugs: Agents such as Class IA and Class III antiarrhythmics pose an additive risk for QT interval prolongation [Source 3.2].
  • Corticosteroids: Concomitant use increases the risk of tendinitis and tendon rupture, particularly in older patients [Source 1.4].
  • NSAIDs (Nonsteroidal Anti-inflammatory Drugs): These agents may lower the cerebral seizure threshold [Source 2.3].
  • Antidiabetic Agents: Co-administration may cause changes to blood glucose levels, requiring careful patient monitoring [Source 1.4].

Mechanism of Action

Flevox (Levofloxacin) exerts its bactericidal action by interfering with the fundamental genetic processes of the bacterial cell, resulting in irreversible cell death. The drug acts as an enzyme inhibitor, primarily targeting two essential bacterial Type II topoisomerases: DNA Gyrase and Topoisomerase IV. Levofloxacin binds to and stabilizes the complex formed between these enzymes and the DNA, thereby blocking the critical resealing step of the genetic material. This primary action causes the rapid accumulation of lethal double-strand DNA breaks and halts DNA replication. Concurrently, the inhibition of Topoisomerase IV is critical for preventing the final separation (decatenation) of replicated chromosomes during cell division. This dual blockade means the bacterial cell is blocked from completing both DNA synthesis and multiplication, contributing to its overall bactericidal effect. The operation of this mechanism is biologically constrained by bacterial defense systems, including target enzyme mutation (reducing drug binding affinity) and active efflux (preventing inhibitory concentration at the DNA site).

Dosage and Administration Information

Flevox (Fluvoxamine Maleate) is administered orally and should be taken exactly as prescribed. Dosage is highly individualized and typically involves a gradual increase over time (titration) to find the most effective dose.

Official Administration Guidelines (Immediate-Release Tablets)

Age Group Starting Dose Titration (Increase Rate) Maximum Daily Dose
Adults (ge 18 years) 50 mg at bedtime Increase by 50 mg every 4–7 days 300 mg/day
Adolescents (12–17 years) 25 mg at bedtime Increase by 25 mg every 4–7 days 300 mg/day
Children (8–11 years) 25 mg at bedtime Increase by 25 mg every 4–7 days 200 mg/day

Frequency and Timing:

The initial dose is generally taken once daily, at bedtime. For total daily doses exceeding 100 mg in adults or 50 mg in children and adolescents, the dose must be divided and administered two or more times a day (e.g., in the morning and at bedtime). If doses are unequal, the larger portion should be given at bedtime. The medication can be taken with or without food.

Special Conditions:

  • Hepatic Impairment: Patients with liver dysfunction should begin on a low dose, and the dose should be increased slowly with close monitoring due to decreased drug clearance.
  • Discontinuation: To minimize the risk of withdrawal symptoms, treatment should not be stopped abruptly. A gradual dose reduction, or tapering, is recommended upon a medical decision to discontinue the medication.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Flevox

Evidence for use in Respiratory Tract Infections (Pneumonia and Bronchitis)

Clinical research exploring Flevox for serious respiratory infections primarily relies on short-term Randomized Controlled Trials (RCTs) and systematic reviews. These studies were conducted during periods of increased symptom activity in individuals with Community-Acquired Pneumonia (CAP) and in adults experiencing Acute Bacterial Exacerbations of Chronic Bronchitis. Researchers examined outcomes related to physical discomfort and systemic imbalance, such as measurements of fever reduction, changes in vital signs, and the rate of microbiologic eradication observed in the studies. Studies report patterns observed in which the frequency of clinical success measurements (related to symptom resolution) was observed when assessed at the end of the short treatment period. Evidence is limited for patients in the most critically ill categories.

Evidence for use in Urinary and Kidney Infections

Flevox was studied for use in conditions associated with acute or disruptive episodes, specifically Complicated Urinary Tract Infections (cUTI) and Acute Pyelonephritis (a kidney infection). The research primarily used RCTs to compare the drug to other approved therapies. Studies explored outcomes reflecting functional or systemic imbalance, including measurements of changes in pain and fever, and the specific rate of microbiologic eradication of uropathogens tracked by researchers. Findings describe patterns observed in the studies related to the rate of bacterial elimination from the urinary tract that was tracked shortly after the treatment course. Data for certain groups remain insufficient, such as in patients with chronic indwelling catheters.

Evidence Gaps and Research Uncertainties

Current evidence highlights areas where more research is needed to provide greater clarity regarding Flevox. Key limitations include the fact that follow-up durations were limited across most indications, leading to limited information for long-term outcomes or the maintenance of clinical stability over months or years. Research provides context but does not predict whether an individual will respond similarly, especially when their profile differs significantly from the typical patient profile observed in the trials.

Frequently Asked Questions (FAQ)

Common questions about Flevox (FAQ)


Q: Does Flevox contain any substances that are known allergens or non-medical ingredients?

According to the official product information, Flevox contains lactose monohydrate as an inactive ingredient. For patients with lactose intolerance or allergies, this component is important to consider. Official information indicates this is the main excipient of note. Patients with specific dietary restrictions or allergies are encouraged to consult a healthcare professional for guidance.


Q: Can I drink alcohol while taking Flevox?

Regulatory documents state that Flevox has no known clinically relevant interaction with alcohol. Official product information does not indicate a requirement to fully restrict alcohol intake while using Flevox. However, it is always advisable to discuss alcohol consumption with a healthcare provider if there are specific concerns related to your health or treatment plan.


Q: What should I do if I forget to take a dose of Flevox?

If a dose is missed, official guidance typically suggests that it may be taken as soon as it is remembered. If it is already nearly time for the next scheduled dose, the advice is usually to skip the missed dose and proceed with the regular schedule. Official information advises against taking a double dose to compensate for a missed one.


Q: Is Flevox known to cause weight gain?

The official product information lists the known effects of Flevox based on clinical trials. Weight changes are documented as a less common side effect, meaning they do not occur frequently in the patient population studied. Any unexpected or significant changes in weight should be discussed with a healthcare provider.


Q: Is Flevox a controlled substance?

According to regulatory classification, Flevox is not designated as a controlled substance in the jurisdictions where it is approved. This classification indicates that it does not fall under the stringent regulations applied to medications with a high potential for abuse or dependence.


Q: What is the medicine Flevox used for?

Flevox is officially indicated for the treatment of various bacterial infections. Regulatory documents specify that it is primarily used in the management of certain infections affecting the respiratory tract and the skin and soft tissues. The exact indications and usage should be confirmed with the official prescribing information.

How should Flevox be stored and disposed of?

How to Store and Dispose of Flevox (Levofloxacin)

Official labeling requires Flevox to be stored under specific environmental and safety conditions to maintain its labeled stability.


Required Storage Conditions

Requirement Description
Temperature Store tablets and oral solution at controlled room temperature, 25 C (77 F), with excursions permitted to 15 C to 30 C.
Handling The Levofloxacin IV solution must be protected from freezing and must be protected from light.
Container Tablets and oral solution must be stored in a tightly closed container.
Safety All forms of Flevox must be kept out of the reach of children.

Official Disposal Protocol

Unused or expired Flevox should be disposed of via drug take-back programs when available. If a take-back program is not feasible, the medicine may be mixed with an unappealing substance, sealed in a container, and discarded in the household trash. It is explicitly required that Flevox not be flushed down the toilet or poured into a drain.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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