Meqazine

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Meqazine

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 Meqazine

Property Description
Active Ingredient Mequitazine (INN)
Form Tablets and Syrup (oral forms)
Pharmacological Class Antihistamine (H1-receptor antagonist)
Common Use Systemic control of allergic symptoms
Origin Synthetic small molecule drug

What is Meqazine and What Type of Medicine is It?

Meqazine is a pharmaceutical preparation containing the active ingredient Mequitazine, which is utilized systemically for the control of allergy symptoms. It is definitively classified as a long-acting Antihistamine and belongs to the chemical group known as Phenothiazine derivatives. This classification is clinically recognized for providing effective, temporary relief of the symptoms of hay fever and other upper respiratory allergies.

The core of the medicine is the active substance, Mequitazine, which is a synthetic small molecule compound. Unlike older, first-generation antihistamines, Mequitazine has been supported by pharmacological studies demonstrating a low propensity to induce drowsiness compared to some other drugs in its class, which is a key feature for patient preference and daily function.

Composition, Forms, and General Therapeutic Purpose

The medicinal product is a single-ingredient preparation, relying solely on Mequitazine for its therapeutic effect. It is commonly supplied for oral administration in two primary dosage forms: Tablets and a liquid Syrup or oral solution. This availability in different forms ensures flexibility for patients, making it suitable for both adults who prefer tablets and those, such as children, who may require a liquid preparation.

The general therapeutic purpose of Meqazine is to provide systemic relief by interrupting the allergic response. It helps control the persistent and disruptive physical manifestations of hypersensitivity, such as intense itching or severe runny nose, which is a typical scenario for which the medicine is used.

How Mequitazine Differs from Other Antihistamines

Mequitazine is functionally differentiated by its characteristic as a potent, long-acting H1-receptor antagonist, a feature that ensures sustained symptom suppression compared to shorter-acting alternatives. Furthermore, studies have noted that Mequitazine also possesses anticholinergic properties. This secondary property may assist in relieving symptoms that involve excessive bodily secretions.

What side effects are possible with Meqazine?

Possible Side Effects and Safety Information

Official regulatory documentation details the spectrum of adverse reactions associated with Mequitazine, categorized by frequency and the affected body system. Safety data is organized to distinguish between the most commonly reported effects and rare, serious events. This profile is consistent with the drug’s classification as a long-acting H1-receptor antagonist.

Adverse Reactions by System-Organ Class

The most commonly reported adverse reactions involve the Nervous System and the Gastrointestinal System. Nervous system effects may include drowsiness, light-headedness, and general malaise. Gastrointestinal effects often manifest as dry mouth and gastric distress.

Classification Examples of Reactions
Most Commonly Reported Drowsiness, dry mouth, gastric distress
Rarely Seen Jaundice, decreased platelet count, anaphylactoid symptoms

Serious Safety Considerations

The official labeling documents rare, but clinically serious, adverse reactions. These include signs of Liver Dysfunction (e.g., jaundice or general malaise) and potentially life-threatening systemic reactions such as Shock or Anaphylactoid Symptoms, which may present with decreased blood pressure or respiratory distress. Decreased platelet count, which can result in unusual bleeding, is also documented as a rare event.

Population-Specific Precautions

Safety statements advise precaution for several specific populations, particularly due to the drug’s secondary anticholinergic properties. Special caution is warranted for the elderly and individuals with conditions like glaucoma or occlusive lower urinary tract disease. The medication is not recommended for use in neonates and is contraindicated in individuals with severe liver disease.

Documentation also notes that certain central nervous system effects, such as psychomotor impairment, may diminish or wear off after several days of treatment.

Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory information emphasizes that an overdose of Meqazine, a Phenothiazine-derivative antihistamine, can be severe and potentially life-threatening. The overdose profile is characterized by effects on the central nervous system (CNS) and the cardiovascular system.

Documented Overdose Manifestations

Symptoms officially documented in regulatory sources include both CNS depression, such as marked drowsiness or coma, and paradoxical CNS excitement, including agitation, confusion, hallucinations, or convulsions (seizures). Anticholinergic signs may also appear, such as tachycardia (rapid heart rate), dry mouth, and urinary retention. Children and infants are specifically noted in official documents as potentially being more susceptible to CNS excitement.

When to Seek Immediate Medical Attention

Due to the critical nature of the documented risks, you must seek immediate medical attention and contact a Poison Control Center or emergency services immediately if an overdose is suspected. This is required even if the individual appears asymptomatic, due to the potential for delayed onset of severe complications.

Official Management and Risks

The primary danger listed in official labeling is the risk of QTc interval prolongation and severe cardiac arrhythmias. Regulatory documents mandate that management must include immediate symptomatic and supportive treatment, with continuous ECG monitoring (heart monitoring) being necessary until cardiac status is stable. No specific antidote is officially documented; treatment focuses strictly on managing the symptoms and supporting vital functions.

Therapeutic Uses of Meqazine

What Meqazine Treats: Main Uses and Benefits

Meqazine is commonly used to help with symptoms related to allergic conditions, which are characterized by periods of heightened symptoms. The medication is relevant for easing symptoms associated with hay fever and other upper respiratory allergies.

It is applied across domains where additional symptomatic support is needed, primarily for allergic rhinitis (seasonal and perennial) and chronic recurrent urticaria (hives). Meqazine is relevant in conditions that present with distressing symptoms like excessive sneezing, persistent runny nose, itchy, watery eyes, and intense skin itching.

“This medication is applied in situations involving certain distressing symptoms, such as severe skin itching, to help ease the overall symptom load.”

The therapeutic benefit supports the patient during difficult episodes by easing distress and contributing to day-to-day comfort. It assists with maintaining a sense of stability, particularly for chronic allergy sufferers who experience symptoms that fluctuate and become more disruptive during flare-ups.


Quick Fact: Use in Persistent Pruritus This medication is often used in settings where symptoms become temporarily overwhelming, offering support for managing the severe skin itching and wheals associated with chronic hives and allergic dermatoses.

Eligibility and Restrictions for Use

Meqazine's official eligibility profile is strictly defined by regulatory criteria regarding patient age and underlying health status. The medicine is contraindicated in patients with a known hypersensitivity to Mequitazine or other drugs in the Phenothiazine class. Absolute non-eligibility also applies to premature infants and full-term neonates.

Contraindications extend to organ function, mandating that the medicine must not be used by individuals diagnosed with Severe Liver Disease. Use is established for adults and adolescents, and for children who meet specific minimum age requirements: 2 years and older for the oral solution and 6 years and older for the tablet form.

Conditional use is noted for several populations and conditions. Special caution is required for patients with Renal Impairment and the Elderly. Furthermore, use is restricted in patients with Severe Cardiovascular Disorders and conditions sensitive to anticholinergic effects, such as Angle-Closure Glaucoma or severe Urinary Retention. For Pregnant and Lactating women, the medicine is listed under Special Precautions and is generally not recommended while breastfeeding.

What should I know about interactions with other medicines?

Interactions with Other Medicines and Products

The interaction profile for Meqazine is defined by its effects on drug metabolism and potential for additive pharmacodynamic consequences.

Pharmacokinetic Interactions

Meqazine is metabolized in part by the Cytochrome P450 2D6 (CYP2D6) enzyme and is also classified as an inhibitor of CYP3A4. Co-administering Meqazine with strong or moderate CYP2D6 inhibitors may significantly increase the plasma concentration of Meqazine. Conversely, using Meqazine alongside strong or moderate CYP2D6 inducers may decrease its effectiveness. As a CYP3A4 inhibitor, Meqazine can increase the systemic exposure of other co-administered medicines that are substrates for CYP3A4.

Pharmacodynamic Interactions

Additive CNS Depression: Concomitant use with other Central Nervous System (CNS) depressants, including alcohol, may result in increased sedation and impairment. This combination should be avoided or used with extreme caution.

Cardiac Risk: Concurrent use of Meqazine with medicines known to prolong the QT interval is associated with an elevated risk of QTc prolongation and potential cardiac adverse events. This combination is generally restricted in clinical practice and should be avoided.

Summary of Restrictions

Official regulatory information emphasizes avoiding co-administration with products that prolong the QT interval and advises caution with strong metabolic enzyme modifiers or other CNS-depressing agents.

Mechanism of Action

How Meqazine Works

Mequitazine acts within domains involving receptor-mediated signaling to modulate pathways associated with the release of specific inflammatory mediators. Its mechanism is founded on two primary inhibitory actions on the peripheral nervous and immune systems, resulting in a modulation of distinct signaling processes.

Histamine mathbfH1 Receptor Blockade

The core action of Mequitazine is the competitive blockade of Histamine H1 receptors located throughout the periphery, particularly on vascular endothelium and sensory nerve endings. By occupying these receptor sites, Mequitazine suppresses the molecular signaling cascade normally triggered by histamine, thereby counteracting histamine-induced increases in vascular permeability and inhibiting the histamine-mediated stimulation of nerve signals.

Modulation of Glandular Secretion

The molecule also engages a secondary mechanism through antagonism of Muscarinic Acetylcholine Receptors. This interaction affects systems where the parasympathetic nervous system governs fluid release. This mechanism limits the nervous signal that stimulates cholinergic-driven fluid secretion from glands.

Peripheral Activity and Mechanistic Constraint

Mequitazine is functionally defined by a low capacity to access targets within the Central Nervous System (CNS), a physicochemical property that results in activity being largely confined to peripheral systems. This selectivity results in the drug's activity being primarily focused on extracerebral modulation, demonstrating a constrained level of interaction with central signaling pathways.

Dosage and Administration Information

How to Use Meqazine


Administration Scope

Meqazine is approved strictly for oral administration, provided in both tablet forms (e.g., 3 mg strength) and as a liquid syrup or solution. The official dosing schedule for adults managing conditions like allergic rhinitis and urticaria typically involves 3 mg taken at one time, administered twice daily, which results in a total daily dose of 6 mg. Some official regimens may permit doses up to 12 mg per day for specific regional indications.


Frequency and Procedural Rules

The prescribed frequency pattern is typically twice daily or once daily, with administration guidelines often noting that the dose, or the primary daily dose, is preferentially taken in the evening. This structured timing is an established part of the official use protocol. For liquid formulations, precise measurement is required to ensure the correct dose is delivered. If an individual misses a scheduled dose, the protocol is that the missed dose must be skipped if it is near the next administration time, and the next dose must never be doubled.


Population and Condition Adjustments

The official usage protocol dictates that the dosage may require adjustment based on factors like the patient’s age, the specific condition being managed, or the presence of underlying hepatic or renal impairment. For pediatric patients, the administration is often weight-based or follows age-specific instructions. Furthermore, Meqazine must not be discontinued unless a healthcare provider explicitly instructs cessation, maintaining the continuity of the official treatment regimen.

Recent Clinical Evidence

Research evidence / Overview of studies for Meqazine


Evidence for Use in Allergic Rhinitis and Conjunctivitis

Research has examined the use of Meqazine in conditions characterized by fluctuating or episodic manifestations, specifically Allergic Rhinitis (hay fever and year-round allergies) and related eye symptoms. The evidence base primarily consists of Randomized Controlled Trials (RCTs) and Systematic Reviews that were applied in research contexts involving fluctuating or unstable symptoms.

Studies was studied in outcomes related to physical discomfort, such as change in nasal symptoms (runny nose, sneezing, congestion) and ocular symptoms (eye itching and watering). These studies were typically conducted during periods of increased symptom activity and observed responses over defined time intervals, often between one and two weeks in those studies. This evidence contributes to the evidence landscape regarding the medicine's role in conditions related to upper respiratory and ocular allergy symptoms.


Evidence for Use in Chronic Urticaria

Meqazine was studied in conditions related to Chronic Urticaria (hives), which is a condition involving periods of heightened symptoms such as intense itching and wheals. The clinical data available includes evidence from focused Clinical Trials and reviews of existing literature. This evidence base pertains to this specific dermatological condition.


Evidence in Specific Patient Groups

The research describes the different populations studied in the evidence base of Meqazine. The primary body of evidence was evaluated in adult populations with diagnosed allergic conditions. Evidence related to specific subgroup findings are uncertain or limited for some populations. Data for certain groups remain insufficient, particularly for dedicated, large-scale studies in the pediatric subgroup, meaning results apply only to the populations studied and are not broadly generalizable.


Long-Term Research and Durability of Response

Clinical trials for Meqazine utilized defined follow-up durations that were limited, typically ranging from one week up to approximately four weeks for chronic conditions. Long-term effects are not fully established, and there is limited information for long-term outcomes regarding the sustained symptomatic change. Research provides context, but it does not characterize the long-term effects or durability of the response.

Frequently Asked Questions (FAQ)

Common questions about Meqazine (FAQ)

Q: Is Meqazine considered a short-term or long-term treatment?

A: According to official information, Meqazine is often prescribed for conditions with fluctuating symptoms, like allergies, and clinical trials typically have limited observation periods, such as a few weeks. Some clinical sources suggest that continuous, prolonged use may not be commonly recommended due to the potential for developing a reduced response (tolerance) or dependency. The consideration for long-term use involves ongoing assessment by a healthcare provider.

Q: Do the side effects of Meqazine typically decrease over time?

A: Official reports indicate that some Central Nervous System (CNS) effects, such as psychomotor impairment (difficulty with coordination or complex tasks), may diminish after several days of continuous treatment. This suggests the body may adapt to these particular effects over time. It is important for patients to discuss any persistent or worsening side effects with a healthcare professional.

Q: Is it possible to have an allergic reaction to Meqazine?

A: Yes, the official documentation states that hypersensitivity to the active ingredient is a contraindication, meaning an allergic reaction is possible. Although rare, serious reactions like anaphylactoid symptoms (which can include severe swelling or breathing trouble) are documented adverse events. If signs of an allergic reaction occur, immediate medical attention is required.

Q: Does Meqazine affect a person's ability to drive or operate machinery?

A: Yes, according to official labeling, Meqazine may impair a person's ability to drive or operate complex machinery. This is due to the potential for adverse effects on the Central Nervous System, including drowsiness, dizziness, and psychomotor impairment. Activities requiring full mental alertness may be affected.

Q: Why is Meqazine sometimes prescribed in different doses for the same condition?

A: Official usage protocols specify that the dosage of Meqazine is individualized. The amount prescribed may require adjustment based on several factors, including the patient’s age, the specific condition being managed, and the presence of any underlying health issues like liver or renal impairment. This approach is consistent with the need to individualize the treatment regimen.

Q: Does Meqazine cause dependency or addiction?

A: Official documentation does not classify Meqazine as an addictive substance or a controlled drug. However, some clinical sources caution that long-term, continuous use may not be commonly recommended due to the potential for developing tolerance (reduced effectiveness) or dependence, which is a clinical consideration separate from addiction.

Q: Can Meqazine cause problems with sleep or insomnia?

A: The most commonly reported Central Nervous System effect of Meqazine is drowsiness. However, official regulatory-derived sources also list insomnia (difficulty sleeping) as a rare possible adverse reaction. It is recommended that individuals discuss significant changes in their sleep patterns with a healthcare professional.

Q: Can Meqazine be taken with common over-the-counter pain relievers?

A: The medicine's interaction profile involves its metabolic pathway in the body. For example, some regulatory data indicates that the metabolism of Mequitazine can be decreased when combined with Acetaminophen, a common over-the-counter pain reliever, which could potentially affect the concentration of Meqazine in the blood. Reviewing all other medicines or products with a healthcare provider is an important safety step.

Q: Are there any specific foods or drinks that should be avoided while taking Meqazine?

A: Official documentation advises that the consumption of alcohol must be avoided while using Meqazine. Combining the two can result in increased sedation and impairment due to an additive Central Nervous System (CNS) depressant effect. No specific food interactions are noted in the general regulatory summaries.

Q: Is there a list of medications that have serious interactions with Meqazine?

A: Official regulatory information explicitly advises caution or avoidance with several categories of medicines. These include products known to prolong the QT interval (a heart-related risk), strong or moderate metabolic enzyme modifiers (CYP2D6/CYP3A4), and other Central Nervous System depressants.

Q: What is the typical duration of treatment with Meqazine?

A: The duration of treatment with Meqazine is determined individually by a healthcare provider based on the condition being treated. While official documents define daily dosing patterns, research studies examining the medicine's effectiveness have typically utilized defined observation periods, often lasting up to four weeks.

Q: Has Meqazine been studied for use in children or pediatric populations?

A: Yes, Meqazine has approved use protocols for pediatric patients. The liquid oral solution form is indicated for children aged 2 years and older, and the tablet form is approved for children aged 6 years and older. This demonstrates that its safety and effectiveness have been established for these specific age groups.

Q: What is the process for discontinuing Meqazine treatment?

A: Official administration rules indicate that Meqazine should not be discontinued without explicit instruction from a healthcare provider. For patients who have used the medicine long-term, some regulatory warnings for similar class drugs note that stopping suddenly may require tapering to avoid the temporary return of symptoms, such as severe itching.

Q: Why is a 'Black Box Warning' or specific safety warning included in the official labeling for Meqazine?

A: Although the term 'Black Box Warning' is not specified, official labeling documents serious safety considerations that warrant explicit warnings. These include the rare risks of Liver Dysfunction (like jaundice), signs of Shock, and severe Anaphylactoid Symptoms. These warnings ensure that healthcare professionals and patients are aware of the most serious documented risks.

Q: Is Meqazine considered toxic if too much is taken (risk of overdose)?

A: Yes, taking doses higher than prescribed (an overdose) can lead to potentially life-threatening side effects. These can include abnormal heart rhythms, severe drowsiness, or seizures. A suspected overdose requires immediate medical attention.

Q: Are there any specific symptoms that require immediate medical attention while using Meqazine?

A: Official safety documentation lists several rare, serious adverse events that require immediate medical attention. These include symptoms such as jaundice (yellowing of the skin/eyes), signs of respiratory distress (severe breathing trouble), or any indication of unusual bleeding. Emergency care is required if these symptoms appear.

Q: Is the efficacy of Meqazine affected by body mass or weight?

A: Official protocols indicate that body weight is a factor in dosing for certain populations. Specifically, for pediatric patients, the administration protocols specify that dosing is often determined based on body weight or follows specific age-based instructions.

How should Meqazine be stored and disposed of?

How to Store and Dispose of Mequitazine

The storage of Mequitazine must strictly follow regulatory requirements to maintain product stability and ensure safety.


Official Storage Conditions

Mequitazine should be stored at room temperature in a cool, dry place. It is essential that the medicine be protected away from light, heat, and moisture to prevent degradation. The container should be kept tightly sealed and the product must not be used past the expiration date on the package.


Handling and Child Safety

It is a mandatory requirement to keep Mequitazine out of the reach of children.


Disposal Instructions

Unused or expired Mequitazine should be disposed of according to local regulations. If no specific product instructions are provided, the general method recommended by health authorities is to dispose of the medicine in household trash or through an authorized drug take-back program.

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

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