Leone

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Leone

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Medically reviewed

Marina Burgos

Last updated on 10/01/2026

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 Leone

Quick Facts

Property Description
Active Ingredient Levocetirizine dihydrochloride
Form Film-coated tablets, Oral solution
Pharmacological Class Selective Histamine H1 Receptor Antagonist
Common Use Relief of allergic conditions
Origin Synthetic (chemically derived R enantiomer)

What is Leone and What is its Active Ingredient?

The medicine Leone is a brand name product containing the single active substance levocetirizine dihydrochloride, which is a synthetic compound administered via the oral route. It is typically available as film-coated tablets and an oral solution, serving as a dedicated anti-allergic medication. It is characterized as the pure, active component (R enantiomer) of its parent compound, cetirizine.

As a single-ingredient product, Leone provides targeted action. This formulation is designed to provide effective relief typically lasting a full 24 hours, often used by patients to manage daily environmental allergy symptoms.

What Type of Medicine is Levocetirizine?

Levocetirizine is a member of the antihistamine group, specifically classified as a selective histamine H1 receptor antagonist. This places it within the category of second-generation antihistamines. Chemically, it is the pure, therapeutically active levorotatory R enantiomer of the older drug, cetirizine.

Levocetirizine is a piperazine derivative with long-lasting H1-antagonist effects. This classification reflects its status as an advanced compound designed to provide reliable relief while minimizing central nervous system effects, distinguishing it from older antihistamine types.

What is the General Purpose of Taking Leone?

The general purpose of taking Leone is to counteract the effects of histamine, a substance the body releases during an immune or allergic reaction. It works by blocking the H1 receptors on cells, preventing histamine from activating them. This mechanism provides generalized, sustained relief from the discomfort and physical manifestations associated with allergic conditions, helping to manage the body's overreaction to allergens.

What side effects are possible with Leone?

Possible side effects and safety information

The safety profile for Leone (levocetirizine dihydrochloride) is structured by governmental regulatory documents, classifying potential adverse reactions according to the body system affected and frequency of occurrence in clinical data and post-marketing surveillance.

Documented Adverse Reactions and Frequency

The most frequently documented effects in adults and adolescents, classified as Common (ge 1/100 incidence), involve the nervous system and include somnolence (sleepiness), fatigue, and headache. Dry mouth and nasopharyngitis are also listed as common. Effects reported at an Uncommon frequency (ge 1/1,000 incidence) include asthenia (unusual weakness), abdominal pain, and certain skin reactions such as pruritus (itching) and rash.

Rare but clinically significant adverse reactions officially documented in regulatory sources include Hypersensitivity reactions, sometimes involving Anaphylaxis, and effects on the cardiovascular system like tachycardia (increased heart rate). Severe neurological events such as convulsion and certain severe psychiatric effects like suicidal ideation and hallucination have also been reported from post-marketing experience with a frequency of Not Known (incidence cannot be estimated).

Safety Constraints and Considerations

The official labeling notes specific safety constraints for certain patient groups. The medicine is contraindicated in patients with End-Stage Renal Disease (ESRD) or severe renal impairment due to increased risk of adverse reactions. Caution is advised for older adults given the higher likelihood of decreased kidney function. A specific time-related safety pattern is documented regarding the potential for somnolence to be more common during the first few hours after intake. Furthermore, new onset or worsening pruritus has been reported upon discontinuation following long-term use.

Overdose and Emergency Response

Overdose and When to Seek Help

In the event of a suspected overdose of Leone (levocetirizine dihydrochloride), immediate medical attention is required. Official regulatory guidance mandates contacting a Poison Control Center or other emergency medical services right away.

Documented Clinical Manifestations

Overdose manifestations are primarily associated with central nervous system (CNS) effects. The presentation may vary by age. In adults, the main documented sign is drowsiness. In children, the official labeling notes an initial phase of agitation and restlessness, followed by drowsiness. When high doses (at least five times the recommended daily amount) are ingested, severe manifestations such as stupor, tachycardia (fast heart rate), confusion, tremor, urinary retention, and mydriasis have been documented in regulatory sources.

Official Management and Limitations

There is no known specific antidote for levocetirizine documented in prescribing information. Management is supportive; regulators recommend symptomatic and supportive treatment. Additionally, gastric lavage should be considered following short-term ingestion. The compound is officially stated as not being effectively removable by haemodialysis, defining a key procedural limitation in management.

Therapeutic Uses of Leone

Leone is relevant in contexts marked by increased discomfort or tension, where additional symptomatic support is needed. It is generally applied when symptoms interfere with daily functioning.


Relief for Seasonal and Year-Round Allergic Rhinitis

Leone is commonly used to support the management of symptoms related to the discomfort of allergic rhinitis, a condition marked by episodic or persistent irritative states of the nasal passages and eyes. This is relevant for managing symptoms associated with both hay fever (seasonal) and perennial (year-around) allergies.

The medication helps address symptom clusters that may become intense or disruptive, including frequent sneezing, irritating runny nose, itchy eyes, nasal congestion, and generalized skin pruritus (itching). This contributes to easing the overall symptom load during periods of heightened symptoms.


Management of Chronic Hives and Skin Itching

Applied in clinical settings that involve recurrent or episodic manifestations, it is used for managing symptoms that create noticeable physiological strain, such as in cases of Chronic Idiopathic Urticaria (CIU). This provides support that helps ease the overall symptom burden, and may help patients cope more steadily with symptom fluctuations often challenged by chronic, unpredictable skin outbreaks.


Quick Fact: Symptomatic Support

Property Description
Primary Indication Allergic Rhinitis (Seasonal & Perennial)
Secondary Indication Chronic Idiopathic Urticaria (CIU)
Symptom Domain Nasal, Ocular, and Cutaneous (Skin) Symptoms
Key Benefit Provides support that helps ease the overall symptom burden

Regulatory References

  1. NIH MedlinePlus overview of Levocetirizine

Eligibility and Restrictions for Use

Who Can and Cannot Use Leone?

Leone (levocetirizine dihydrochloride) can be used by most adults and adolescents mathbf12 years of age and older. The oral solution formulation is eligible for children as young as mathbf6 months for specific uses, although the tablet form is not recommended for children under six years.

Contraindicated Populations

Use of Leone is strictly contraindicated and must not occur if a patient has a known hypersensitivity to levocetirizine, cetirizine, hydroxyzine, or other related piperazine derivatives. Absolute prohibition also applies to patients with end-stage renal disease, defined by a creatinine clearance of less than mathbf10 mL/min, and to children aged mathbf6 to mathbf11 years with any level of impaired renal function.

Condition-Based Restrictions

Eligibility is conditional on kidney function. Individuals with mild, moderate, or severe renal impairment require conditional use involving a modification of the dose frequency. Conversely, patients with solely hepatic impairment are eligible for use under standard conditions.

Physiological States

Official regulatory documents state that use during pregnancy and lactation is generally not recommended or advised only if clearly necessary. Additionally, caution should be exercised in patients with epilepsy or predisposing factors for urinary retention, as explicitly documented in the regulatory labeling.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official interaction profile for Leone (levocetirizine dihydrochloride) is defined by its primary elimination pathway and its potential for additive effects on the central nervous system (CNS).

Pharmacodynamic Interactions

Co-administration with alcohol (ethanol) or other CNS depressants may cause an additive impairment of central nervous system performance and lead to additional reductions in alertness. Regulatory documents advise against concurrent use with these substances.


Pharmacokinetic and Clearance Interactions

Due to the medicine's substantial renal clearance, it is formally contraindicated in patients with end-stage renal disease (creatinine clearance less than 10 mL/min). The drug is also contraindicated for pediatric patients (6–11 years) with impaired renal function.

Specific drug-drug interactions documented in regulatory labeling show that co-administration with Ritonavir leads to increased levocetirizine exposure due to a reduction in clearance. Similarly, Theophylline has been documented to cause a small decrease in clearance. Levocetirizine is considered unlikely to produce significant pharmacokinetic interactions through liver enzymes, as hepatic metabolism is minor.


Drug-Food Interaction

While food does not reduce the overall extent of absorption, it is documented to decrease the rate of absorption of levocetirizine.

Mechanism of Action

Selective Inverse Agonism of the H1 Receptor

The primary mechanism involves the active substance, levocetirizine, functioning as a highly selective H1 receptor inverse agonist. This action blocks the effects of the inflammatory mediator, histamine, by binding to the receptor and stabilizing its inactive state, which contributes to the suppression of rapid signaling events that drive acute H1 R-mediated physiological effects. The molecule’s high binding affinity and slow dissociation kinetics result in a prolonged duration of inhibitory effect, contributing to the consistent modulation of the H1 R-mediated pathway.


Modulation of Tissue-Level Physiological Responses

By disrupting the H1 R signaling cascade on peripheral tissues, the mechanism yields two main physiological consequences. On vascular endothelial cells, it limits the loosening of cell junctions, which prevents the leakage of fluid and protein into tissues, thereby modulating the physiological processes that lead to localized fluid extravasation. Concurrently, it suppresses the histamine-induced activation of sensory nerve endings, which constitutes the physiological pathway for H1 R-mediated cutaneous sensory activation.


Non-Histamine-Mediated Anti-Inflammatory Modulation

Beyond direct receptor blockade, the mechanism engages in the modulation of the overall inflammatory cascade at the cellular level. This includes an inhibitory effect on the movement of eosinophils, a key inflammatory cell type, across blood vessel walls and into the tissues. This secondary action restricts the infiltration of immune cells, contributing to the modulation of the physiological response characterized by cellular recruitment.

Dosage and Administration Information

How to Use Leone — Administration Guidelines

The general principles for using Leone establish the route, standard dosage, and frequency patterns for the active ingredient, levocetirizine. Administration is via the oral route, with the standard adult dose for individuals aged 12 and older set at 5 mg once daily, which also serves as the maximum daily dose. Dosing is recommended to be taken in the evening and may be administered with or without food.

Feature Instruction
Route of administration Oral (taken by mouth).
Dosing schedule (Adults aged 12 years and older) 5 mg once daily (maximum).
Timing in relation to meals With or without food.

Usage varies by age and kidney health. Children aged 6 to 11 years are typically administered 2.5 mg once daily, while children 6 months to 5 years receive 1.25 mg daily (usually using the oral solution). The 5 mg tablet is not suitable for children under 6 years due to dose limitations.

Dose adjustment is applied for adult patients with reduced renal function (impaired creatinine clearance), involving a lower dose or altered frequency. For instance, patients with moderate renal impairment receive 2.5 mg once every other day. If a dose is missed, the standard protocol is to resume the schedule with the next dose at the regular time, without doubling the subsequent dose. This ensures continuous drug exposure while preventing exceeding of the defined maximum limits.

Recent Clinical Evidence

Research evidence / Overview of Studies for Leone

Evidence for use in Allergic Rhinitis (Seasonal and Perennial)

Research has explored the use of Leone in conditions characterized by fluctuating or episodic manifestations, such as seasonal and perennial allergic rhinitis. The research design largely consisted of randomized controlled trials (RCTs), which compared outcomes in groups administered levocetirizine against groups administered an inactive substance (placebo). Studies monitored patient-reported outcomes describing perceived discomfort linked to nasal and ocular symptoms (measured as Total Symptom Scores) and explored outcomes reflecting daily functioning.

Studies tracked measured symptom scores and reported differences in these scores between the groups administered levocetirizine and the groups administered placebo over the defined time intervals. The evidence contributes to understanding symptom patterns, particularly concerning short-term symptom tracking.


Evidence for use in Chronic Idiomatic Urticaria (Hives)

Research also explored the medicine in contexts involving chronic idiopathic urticaria (CIU). Research examined short-term symptom changes, primarily using controlled trials and studies that explored different treatment levels (dose-response studies). Outcomes monitored included the Urticaria Activity Score (UAS), wheal frequency, and severity of skin itching.

Studies tracking the UAS and hive frequency reported differences in these measurements between groups administered the medicine and the groups administered placebo. Research describes differences observed in studies when the treatment level was adjusted, which provides context for understanding symptom intensity or variability.


Research Gaps and Limitations

Long-term effects are not fully established, as the available evidence is largely derived from research exploring short-term symptom changes, with most controlled studies having limited follow-up durations. Data remain insufficient for extended use, and evidence highlights what is known—and what is still uncertain—about outcomes linked to prolonged use.

Data for certain special populations remain insufficient. For example, subgroup findings are uncertain for older adults or those managing comorbid conditions. Additionally, there is a lack of consistent evidence across trials regarding certain measured outcomes, such as the specific tracking of nasal congestion.

Key Studies & References

  1. A Study to Compare the Efficacy of Levocetirizine to Placebo in Reducing Symptoms of Seasonal Allergic Rhinitis (SAR) in Sensitive Subjects Exposed to Ragweed Pollen | ClinicalTrials.gov (NCT00291642)

Frequently Asked Questions (FAQ)

Common questions about Leone (FAQ)


Q: How quickly should I expect Leone to start working?

Studies indicate that the active substance in Leone, levocetirizine, is rapidly absorbed after you take it. Maximum concentration in the blood is often reached in about one hour in the average person. Pharmacological activity, such as the suppression of skin reactions, is often observed to begin within 2 to 4 hours after administration.


Q: How long does Leone stay in your system after you stop taking it?

The time it takes for the concentration of levocetirizine in the blood to drop by half (known as the elimination half-life) is documented as approximately 7.9 hours in adults. The drug is mainly eliminated through the urine via the kidneys. The body’s elimination process is gradual, and the substance is cleared over time, consistent with the half-life.


Q: Do the side effects of Leone get worse over time or eventually go away?

Regulatory documents state that somnolence (sleepiness) may be more common during the first few hours after intake. For patients on long-term daily use, official warnings document a risk of new or worsening pruritus (severe itching) that may occur upon discontinuing the medicine.


Q: What are the most commonly reported side effects of Leone?

Regulatory documents classify several effects as common in adults and adolescents. These frequently reported side effects include somnolence (drowsiness), fatigue, headache, dry mouth, and nasopharyngitis (sore throat/cold symptoms).


Q: Is it normal to feel [vague side effect, e.g., tired or dizzy] when starting Leone?

Feelings of fatigue and somnolence are listed as common adverse reactions in regulatory documents, as these are classified as common adverse reactions. While dizziness is not among the most common effects, official warnings address possible effects on the central nervous system, which may affect alertness.


Q: Does Leone require any special monitoring or blood tests?

For the general user, there are typically no routine blood tests required. However, the official prescribing instructions state that the dose must be modified for patients with reduced kidney function. This adjustment is based on estimated creatinine clearance, a parameter often determined by laboratory measurement of serum creatinine.


Q: Can women who are pregnant or breastfeeding use Leone?

Regarding pregnancy, levocetirizine is categorized as FDA Pregnancy Category B. This classification means that while animal studies have not demonstrated a risk to the fetus, it is advised for use during pregnancy only if clearly needed. For breastfeeding, the medicine is expected to pass into human milk, and its use is generally not recommended for nursing mothers.


Q: What are the ingredients in Leone besides the main active component?

Beyond the active ingredient, levocetirizine dihydrochloride, Leone contains various inactive ingredients, or excipients. These components are necessary for the product's function, such as providing structure or aiding stability. The complete list of excipients is detailed in the official regulatory labeling for the specific tablet or oral solution formulation.


Q: Does taking Leone affect weight (gain or loss)?

Weight change, either gain or loss, is not listed among the documented common or uncommon adverse reactions in official regulatory documents. The documented adverse reactions focus on reported effects from clinical studies and post-marketing experience.


Q: What is the risk of dependence or addiction with Leone?

Official product information does not classify Leone as a controlled substance, and dependence is not listed as a documented side effect. However, regulatory warnings do focus on potential central nervous system (CNS) effects and advise caution against using it with other CNS depressants due to the risk of additive impairment.


Q: Does Leone interact with common pain relievers like ibuprofen or acetaminophen?

Specific pharmacokinetic studies with common non-prescription pain relievers like ibuprofen or acetaminophen are not reported in regulatory labeling. The official documentation states that levocetirizine is unlikely to cause significant pharmacokinetic interactions through the liver's enzyme systems.


Q: How often do people typically need to take Leone?

The standard dose for adults and adolescents is set to be taken once daily. This dosing schedule is established in regulatory documents to provide effective relief that lasts a full 24 hours.


Q: How long does it take for side effects from Leone to resolve after stopping treatment?

Official warnings document that a specific reaction, new or worsening pruritus (itching), has been reported upon discontinuation of long-term use. This specific effect was observed to resolve within a few days of discontinuing long-term daily use. The resolution time for other potential reactions is variable.


Q: Does taking Leone affect my ability to drive or operate machinery?

Official labeling contains explicit warnings advising that the medicine may affect the ability to engage in activities requiring complete mental alertness and motor coordination, such as operating machinery or driving a motor vehicle. This caution is related to documented effects like somnolence.


Q: Is Leone available as a generic medicine?

Leone is a brand name product. Its active ingredient is levocetirizine dihydrochloride. The active ingredient is widely available in generic versions, though their specific approval and market availability depend on the regulatory status in each country.


Q: Can Leone be split or crushed for easier swallowing?

The official administration guidelines for the film-coated tablet formulation instruct that it should be swallowed whole with liquid. The standard regulatory documents for the tablet formulation do not describe or specifically authorize any practice involving the physical alteration of the film-coated tablets, such as splitting or crushing.


Q: What is the success rate of Leone in clinical trials?

In randomized controlled trials, the medicine was shown to achieve a statistically significant reduction in patient-reported symptom scores compared to an inactive substance (placebo). Regulatory documents provide the statistical data from these trials, but they do not summarize the findings into a single 'success rate' percentage.


Q: Does Leone interact with caffeine?

Official regulatory documents do not report specific drug interaction studies with caffeine. The documented warnings regarding interactions focus on alcohol and other medications that act as central nervous system depressants.


Q: What is the maximum duration for which Leone has been studied?

Clinical research has examined the use of the 5 mg dose of levocetirizine for treatment periods of at least 6 months in allergic rhinitis. Furthermore, the parent compound (cetirizine) has been studied for up to one year in chronic urticaria and chronic allergic rhinitis.


Q: Are there any specific lifestyle changes that are recommended when taking Leone?

Official labeling primarily recommends specific behavioral precautions. These include the advice to avoid co-administration with alcohol and to exercise caution or avoid operating machinery or driving due to the risk of impaired alertness and motor coordination.


Q: What is the difference between Leone and a placebo in clinical studies?

In clinical studies, the group of patients who received Leone (levocetirizine) experienced a statistically significant improvement in measured allergy symptom scores compared to the group that received an inactive substance (placebo). This result is key to the medicine's official authorization.


Q: What is the purpose of the inactive ingredients in Leone?

The inactive ingredients, or excipients, are essential components of the drug's formulation. Their purpose is to provide necessary structure for the dosage form (like the tablet), stabilize the medicine over its shelf life, and potentially assist in the body's absorption of the active ingredient.

How should Leone be stored and disposed of?

How to Store and Dispose of Leone

The storage and disposal of Leone (levocetirizine dihydrochloride) must strictly adhere to the conditions mandated by official regulatory labeling to ensure product quality and safety.


Storage Requirements

Condition Requirement
Temperature Store at controlled room temperature, typically between 20 and 25 C (68 and 77 F), or below 30 C
Protection Keep away from excess heat, moisture, and light. Keep from freezing and store in a dry place
Container Must be kept in the original container, tightly closed
Child Safety Store strictly out of the sight and reach of children

Disposal

Unused or expired Leone must be disposed of in accordance with local regulatory requirements for medicinal waste. Discharge into the environment or sewage system must be avoided. Patients should consult a healthcare professional regarding local drug take-back programs.

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

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