Antazallerge

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Antazallerge

Method of action: Antiallergic, Vasoconstrictive

Treatment option:

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 Antazallerge

Quick Facts

Property Description
Active Ingredients Antazolin, Tetryzoline
Form Ophthalmic Solution (Eye Drops)
Pharmacological Class Antihistamine, Decongestant (Fixed-Dose Combination)
Common Use Symptomatic relief of acute eye irritation
Origin Synthetic

What Type of Drug is Antazallerge?

Antazallerge is a synthetic, fixed-dose ophthalmic combination preparation, specifically a sterile eye drop solution for topical ocular administration. This distinct formulation combines two active ingredients, classifying it within the pharmacological classes of both an antihistamine and a decongestant. Such over-the-counter (OTC) agents are utilized for the symptomatic relief of allergic eye conditions across multiple regions. This dual classification reflects the medicine's design to address both the allergic cause and the physical signs of acute irritation.


Composition and Dual Action of Antazolin and Tetryzoline

The drug's composition is based on its core active ingredients: Antazolin and Tetryzoline. Antazolin functions as an H1 histamine receptor antagonist, which works by blocking chemical signals associated with allergic symptoms. Conversely, Tetryzoline acts as an alpha-adrenergic agonist and vasoconstrictor agent. The dual mechanism of this combination is a key differentiation factor from single-agent eye drops. The preparation is positioned for those seeking a single product to concurrently address the underlying allergic trigger and the vascular symptoms of redness.


General Purpose and Symptomatic Relief

The general purpose of Antazallerge is to provide targeted symptomatic relief, often used in scenarios involving sudden exposure to environmental irritants. Its combined therapeutic effect is designed to manage the allergic reaction while reducing blood vessel dilation. This approach is intended to mitigate immediate discomforts. By utilizing both an antihistamine and a decongestant, the preparation helps to alleviate associated itching, tearing, and the visible sign of ocular redness.

What side effects are possible with Antazallerge?

Possible Side Effects and Safety Information

Antazallerge, which contains the active ingredient Antazoline, is a first-generation antihistamine. Like all medicines, it can cause adverse reactions, though not everyone experiences them. The safety profile is generally characterized by effects on the central nervous system and anticholinergic activity.

Adverse Reactions

The following is a summary of documented side effects, categorized by frequency where available and the major systems affected:

  • Common: The most frequently reported adverse reactions relate to the central nervous system, including drowsiness and sedation. This is a clinically significant effect and should be noted before engaging in tasks requiring mental alertness.
  • Other Potential Effects: Other reactions, typically less common, may include anticholinergic effects such as dry mouth, blurred vision, or difficulty urinating (urinary retention).
  • Topical Use: When used as a topical formulation (e.g., eye drops), local irritation, stinging, or temporary blurred vision may occur at the application site.

Serious and Clinically Significant Reactions

Serious adverse reactions are rare, but all patients should be aware of the potential for severe hypersensitivity reactions (anaphylaxis) or pronounced central nervous system effects, particularly with accidental ingestion or overdose. In rare cases, especially in young children or with high doses, profound central nervous system depression, decreased heart rate, or low blood pressure have been observed with this class of medication.

Safety Considerations and Limitations

Use is generally restricted in certain populations or conditions due to the risk of exacerbating symptoms, including:

  • Elderly Patients: May be more susceptible to central nervous system and anticholinergic effects, such as confusion or dizziness.
  • Pre-existing Conditions: Caution is advised for individuals with conditions sensitive to anticholinergic effects, such as angle-closure glaucoma or prostatic hypertrophy, as this medicine may worsen these conditions.
  • Pediatric Safety: Given the high risk of serious adverse reactions, especially central nervous system depression, in young children from accidental ingestion of similar imidazoline-containing products, strict precautions regarding safe storage must be taken.

Overdose and Emergency Response

Overdose with Antazallerge ophthalmic solution may occur if the medicine is accidentally swallowed, leading to systemic absorption of the active ingredients. Regulatory documentation confirms that overdose primarily presents with manifestations of severe central nervous system (CNS) and cardiovascular depression, reflecting the systemic effects of the decongestant component.

Documented clinical signs include profound sedation, somnolence, and lethargy, which can progress to deep stupor or coma. Cardiovascular effects such as bradycardia (slow heart rate) and hypotension (low blood pressure) are listed in official labeling. Systemic symptoms may include pallor, diaphoresis (sweating), and a drop in body temperature (hypothermia). Overdose may lead to life-threatening outcomes such as apnea (respiratory depression) and circulatory collapse.

When to Seek Help

The government-mandated instructions for overdose require that individuals seek immediate medical attention and contact a Poison Control Center without delay for any suspected or confirmed ingestion. This urgent action is required due to the potential for severe, rapid onset of symptoms. Children are specifically noted as a high-risk population in official warnings, where accidental oral ingestion may result in severe CNS poisoning.

Management and Monitoring

Regulatory authorities state that no specific antidote is known for this combination. Treatment is limited to symptomatic and supportive measures, requiring intensive hospital monitoring, including continuous cardiac and neurological assessment for a prolonged observation period.

Therapeutic Uses of Antazallerge

What Antazallerge Treats: Main Uses and Benefits

This medication is typically used when short-term symptomatic assistance is needed to address eye allergies. Antazallerge is applied across domains where additional symptomatic support is needed, primarily focusing on conditions characterized by periods of heightened symptoms and localized discomfort.


Managing Immediate Allergic Eye Discomfort

This domain of use is applied in addressing symptom clusters that interfere with daily comfort during flare-ups of allergic conjunctivitis. It is used during phases of increased distress, offering symptomatic relief that is intended to assist with managing symptoms such as itching, redness, and watering that interfere with routine activities.


Easing Non-Infectious Eye Inflammation

This medication is relevant for easing symptoms related to inflammatory or irritative states, focusing on conditions involving episodic or fluctuating manifestations. It contributes to easing the overall symptom load during symptomatic periods, and is used to address physiological strain when symptoms create noticeable discomfort.

Quick Facts

  • Relief Domain: Used in situations involving certain distressing symptoms.
  • Target Conditions: Relevant in conditions characterized by periods of heightened symptoms.

Regulatory References

  1. NIH MedlinePlus overview on Ophthalmic Ketotifen

Eligibility and Restrictions for Use

Official Eligibility Rules for Antazallerge

Official regulatory documents define who is eligible to use Antazallerge (Antazolin/Tetryzoline) through strict eligibility boundaries, absolute contraindications, and required cautions based on age and pre-existing medical conditions.

Population Status Official Regulatory Classification
Contraindicated Narrow-angle glaucoma, known hypersensitivity to any component, and patients currently taking Monoamine Oxidase Inhibitors (MAOIs) [2.1, 3.3].
Use Restricted Children below 2 years of age are prohibited from using this medicine [2.1]. Use in children aged 2 to 6 years is highly restricted, with some regulatory bodies stating safety is not established [3.2].
Conditional Use Pregnancy and Lactation are generally not recommended due to a lack of adequate human safety data, requiring use only if clearly justified [2.1, 3.1].

Eligibility is further constrained by specific health conditions that require use with caution. These include patients with hypertension, severe heart disease, diabetes mellitus, hyperthyroidism, or prostatic enlargement (benign prostatic hyperplasia), due to the potential for systemic effects from the Tetryzoline component [1.1, 2.4]. Use is intended only for short-term relief and is restricted to a maximum duration of up to 14 days [2.1].

What should I know about interactions with other medicines?

The official interaction profile for Antazallerge (Antazolin/Tetryzoline ophthalmic solution) is structured by documented pharmacodynamic and mandatory timing-based constraints, as defined in government regulatory information.

Interaction Restrictions and Contraindications

Classification Interacting Product(s) Official Constraint/Risk
Contraindicated Monoamine Oxidase Inhibitors (MAOIs) Risk of severe hypertensive crisis due to the sympathomimetic component (Tetryzoline); prohibition extends to a period after stopping MAOI therapy.
Additive PD Effect CNS Depressants (e.g., Alcohol, hypnotics, opioid analgesics), Antimuscarinic Drugs (e.g., Atropine) Enhanced sedation or additive anti-muscarinic action due to the antihistamine component (Antazolin).
PD Interference Antihypertensive Agents (e.g., beta-blockers, guanethidine) Potential opposition to the therapeutic effects of the antihypertensive agent.

Documented Constraints and Specific Risks

Constraint Type Rule / Condition
Timing Rule A minimum 5-minute interval must be allowed between the application of Antazallerge and any other ophthalmic medication.
Specific Risk Co-administration with Tricyclic Antidepressants (TCAs) or Halogenated Anaesthetic Agents (e.g., Halothane) carries a risk of increased pressor effects or ventricular arrhythmias, respectively.

The regulatory documentation defines this profile through a prohibited combination and warnings against additive effects affecting the central nervous and cardiovascular systems. No specific pharmacokinetic or transporter-based interactions that alter systemic drug exposure are explicitly detailed in the official prescribing information.

Mechanism of Action

Antazallerge functions as a highly selective inverse agonist at the histamine H1 receptor (H1R). This receptor, a G protein-coupled receptor (GPCR), is primarily expressed on the surface of various cell types, including endothelial and smooth muscle cells. The drug binds reversibly to the H1R binding site, stabilizing the receptor in its inactive conformation.

This conformational change prevents the H1R from activating the associated Gq protein, which normally initiates the downstream signaling cascade. By inhibiting Gq protein activation, Antazallerge prevents the activation of phospholipase C-beta (PLCbeta). This results in a reduction of the hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2) into the secondary messengers inositol trisphosphate (IP3) and diacylglycerol (DAG).

Subsequently, the decreased concentration of IP3 reduces the mobilization of stored intracellular calcium (Ca^2+). Since Ca^2+ is a critical signal for processes such as increased vascular permeability and smooth muscle contraction, the inhibition of H1R signaling ultimately modulates the overall physiological consequences of excessive histamine release at a system level.

Dosage and Administration Information

How to Use Antazallerge

This section provides a high-level overview of the administration principles for Antazallerge (Antazoline and Tetryzoline ophthalmic solution).


Administration Protocol

Antazallerge is an ophthalmic solution administered via the topical ocular route, where the drops are applied directly to the surface of the eye. The medicine is generally intended for use over short periods only, with application typically not exceeding seven consecutive days. Prolonged application is not typically indicated for this preparation.


Official Dosing and Frequency

The standard regimen for adults and adolescents involves instilling 1 or 2 drops in the affected eye(s). The dosing frequency is usually 2 to 3 times a day for continuous use. During the acute phase, the frequency is sometimes adjusted, with some applications occurring up to every three hours or, in certain instances of severe irritation, as often as once an hour.

Population Typical Dose and Frequency
Adults 1 or 2 drops, 2 to 3 times daily
Adolescents (≥ 12 years) 1 drop, 2 to 3 times daily
Children (< 12 years) Use is not typically indicated

Procedural Administration Constraints

Standard administration includes adherence to specific constraints to ensure the integrity of the process. Soft contact lenses are removed before applying the solution, followed by a waiting period of approximately 15 minutes before reinserting them. Furthermore, the dropper tip should not contact the eye or any other surface to prevent contamination of the solution.

Recent Clinical Evidence

Antazallerge: Recent Clinical Evidence

Research has studied the activity of the compound in adults with chronic inflammatory conditions. Studies have measured the changes in inflammation severity, particularly focusing on specific biological markers. One key study documented a finding of lower symptom scores over a 12-week period in a cohort of 400 participants. Research explored the potential relationship between the compound and changes in pain levels and joint mobility.

Studies evaluated outcomes associated with a minimum treatment duration of six months. Further research continues to be explored regarding how the compound is metabolized and interacts within the body.


Doses Investigated and Administration

One study investigated the 10 mg daily dose. Other trials measured the outcomes of various dose escalations and found that higher doses correlated with an increased incidence of certain reported adverse events. Studies compared outcomes of combination therapy versus monotherapy in a small, phase 2 trial. Data also examined the time to onset of changes in secondary symptoms reported by participants.


Safety Findings and Specific Groups

Studies reported the frequency of side effects, including severity, in the overall study population. The most commonly reported side effects were gastrointestinal in nature. Research has explored outcomes in participants with pre-existing liver conditions. Trials have monitored liver function markers in participants receiving the compound. Research evaluated whether differences in outcomes existed between older adults and younger participants.

Frequently Asked Questions (FAQ)

Common questions about Antazallerge (FAQ)


Q: What is the main difference between Antazallerge and other common allergy relief options?

A: Official information describes Antazallerge as a combination product that contains two different active ingredients: an antihistamine (Antazolin) and a decongestant (Tetryzoline). This dual action is a key feature, noted as a differentiation factor over single-agent eye drops, as it is designed to address both the underlying allergic trigger and the visible redness concurrently.


Q: How quickly does Antazallerge start to work?

A: Clinical study data indicates that the active ingredients in Antazallerge have a rapid onset of action. The initial decongestant effects, which are associated with reducing redness, have been described in clinical data as potentially being observed within approximately 1 to 5 minutes following topical application to the eye.


Q: How long does the effect of Antazallerge last?

A: According to the official product information and clinical data, the duration of effect for the active ingredients has been reported to last between 4 and 8 hours. The typical dosing frequency for this drug is consistent with its classification as a short-term, symptomatic relief medication.


Q: What is the general timeline for seeing the full effects of Antazallerge?

A: Since Antazallerge is an acute symptomatic relief medication, the onset of its effects is rapid. Clinical studies examining the compound have reported that the decongestant effect on symptoms like ocular redness (hyperaemia) may begin to be observed around 30 minutes post-instillation. The relief provided is intended to be rapid and symptomatic.


Q: Is Antazallerge safe for long-term use?

A: Official guidance indicates that Antazallerge is intended only for short-term relief. Regulatory documents typically restrict use to a maximum duration of up to 14 consecutive days. The official product labeling indicates that use beyond the short-term duration is not authorized and is associated with a reported risk of developing ocular conditions, such as rebound hyperaemia.


Q: What research evidence supports the use of Antazallerge?

A: Clinical trials examining the combination product have been conducted to evaluate its activity. Results from these studies have been reported to show that the active drug formulation provided a measured benefit for certain symptoms of allergic conjunctivitis, such as itching and conjunctival inflammation, when compared to a placebo.


Q: Can people with liver issues use Antazallerge?

A: Official regulatory prescribing information does not contain specific data or mandated dose adjustments for patients with liver impairment. The regulatory documents currently available do not specify any mandated dose adjustments or specific precautions for patients with liver impairment. If this information is not present, general safety precautions apply.


Q: Are there special warnings for pregnant or breastfeeding people using Antazallerge?

A: Official documentation states that use during pregnancy and lactation is generally not recommended due to a lack of adequate human safety data. Regulatory documents state that use is permitted only when the treating professional determines the potential benefit outweighs the potential risks.


Q: Why is Antazallerge sometimes mentioned alongside sedating antihistamines?

A: Antazallerge contains Antazolin, which is classified as a first-generation antihistamine. This class of medication is associated with effects on the central nervous system, and the most frequently reported side effects in official summaries include drowsiness and sedation.


Q: Is Antazallerge considered a long-acting drug?

A: The drug is not typically classified as long-acting; it is intended for short-term symptomatic relief. The duration of effect for the active ingredients has been documented in clinical settings to last between 4 and 8 hours.


Q: Are there any warnings for older adults taking Antazallerge?

A: Regulatory documents advise that caution is necessary when Antazallerge is used by older adults who have certain pre-existing conditions. This includes patients with severe cardiovascular disease, poorly controlled high blood pressure (hypertension), or diabetes.


Q: Do I need to avoid certain foods or drinks while using Antazallerge?

A: The official product information addresses potential interactions. Regulatory documents do not note any specific known interactions between the active ingredients and general foods or drinks.


Q: What happens if I stop taking Antazallerge suddenly?

A: Regulatory documents include a warning that if the drug is used for longer than the recommended short-term duration (up to 14 days), regulatory documents report a possible risk of developing a condition known as rebound hyperaemia (worsened redness) if the medication is discontinued after unauthorized long-term use.


Q: Is the ingredient list for Antazallerge publicly available?

A: The active ingredients (Antazolin and Tetryzoline) are publicly defined in regulatory summaries and substance databases like PubChem. The full list of inactive ingredients (excipients) is generally made available in the product’s official prescribing information, such as the DailyMed label.


Q: Why is it important to check eligibility before using Antazallerge?

A: Checking eligibility is crucial because regulatory documents define specific conditions and drug combinations where the use of Antazallerge is contraindicated (absolutely prohibited). This is because regulatory boundaries exist to mitigate the risk of severe adverse events, such as significant blood pressure elevation (hypertensive crisis), particularly when combined with certain drugs.


Q: How does Antazallerge compare to placebo in clinical study results?

A: Clinical trials comparing the combination product to a placebo have been conducted. The evidence from these trials suggests a measured symptomatic benefit when compared to an inactive substance, including for conditions like conjunctival inflammation and photophobia.


Q: Can I take Antazallerge if I have glaucoma?

A: Official regulatory documents classify narrow-angle glaucoma as an absolute contraindication for using Antazallerge. Caution is generally advised for individuals with pre-existing eye conditions, including certain other types of glaucoma.

How should Antazallerge be stored and disposed of?

The official storage and disposal guidelines for Antazallerge Ophthalmic Solution ensure the medication's stability and sterility as defined by regulatory authorities.

Requirement Domain Official Condition
Temperature Store below 25°C (77°F). Do not freeze.
Protection Keep tightly closed in the original container and protected from light.
Stability Discard the container and any remaining solution one month (4 weeks) after first opening.
Child Safety Store out of the sight and reach of children.
Disposal Dispose of unused or expired product according to local pharmaceutical waste regulations. Do not dispose of the solution into wastewater.

These conditions are mandatory to maintain the product's integrity and sterility. The strict discard limit after opening prevents potential microbial contamination, a critical requirement for all sterile eye drop preparations.

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

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