Metaspray

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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 Metaspray

Metaspray is a prescription-only medicinal product defined by its core therapeutic agent, Mometasone Furoate. It is categorized as a synthetic corticosteroid preparation, specifically belonging to the glucocorticoid pharmacological class. This medication is exclusively designed for focused, local action within the nasal passages.


Quick Facts

Property Description
Active ingredient Mometasone Furoate
Form Intranasal spray (Metered-Dose Aqueous Suspension)
Pharmacological class Corticosteroid (Glucocorticoid)
Common use Relief of nasal symptoms
Origin Synthetic compound

Mometasone Furoate: Defining the Drug Entity and Pharmacological Class

The fundamental identity of Metaspray is derived from its active ingredient, Mometasone Furoate (Mometasone Furoate Nasal Spray). Mometasone is a highly potent compound used for its anti-inflammatory properties. Consequently, this medicine is effective at reducing inflammation within the body's tissues. Mometasone Furoate is a synthetic corticosteroid, clinically recognized for its high receptor affinity and potent local action, which minimizes the drug's effect beyond the nasal lining.

Composition, Form, and Origin

This medicine is a single product prepared as a specialized dosage form, an intranasal spray, intended for localized administration via the intranasal route. The product is physically supplied as a metered-dose aqueous suspension, where the Mometasone Furoate is held in a water-based (aqueous base) medium. The active component is of synthetic origin, guaranteeing its consistent stability and precise high-potency performance for direct application to the nasal mucosa. This specific drug form is designed to allow for high local activity with minimal risk of systemic absorption. This means the medication primarily acts only in the nose, minimizing effects elsewhere in the body.

General Purpose as an Anti-inflammatory Agent

The general purpose of this medicine stems from its robust anti-inflammatory properties and vasoconstrictive properties. The compound is formulated to reduce the underlying mechanisms that trigger inflammation in the nasal passages. By targeting and minimizing the inflammation, the ultimate general benefit is to provide relief from various nasal symptoms, such as stuffiness or obstruction, helping patients to maintain comfortable and open nasal breathing.

What side effects are possible with Metaspray?

Possible side effects and safety information

Metaspray (Mometasone Furoate Nasal Spray) has an officially documented safety profile characterized by both frequent local reactions and rare, serious systemic potentials, as defined by government regulatory authorities.


Frequency-Classified Adverse Reactions

The following are classified based on clinical trial data and regulatory documents, typically falling into established frequency bands:

Classification Examples of Reactions
Common (≥ 1/100 to < 1/10) Headache, Epistaxis (Nosebleeds), Pharyngitis, Nasal burning, Nasal irritation, Nasal ulceration.
Not Known (Post-Marketing) Glaucoma, Cataracts, Nasal septal perforation, Hypersensitivity reactions (e.g., Angioedema, Anaphylaxis), Adrenal suppression.

These effects are formally grouped into System-Organ Classes including Respiratory, Thoracic and Mediastinal Disorders and Eye Disorders.


Safety Constraints and Population Notes

The safety documentation outlines specific use limitations and risks:

  • Duration-Related Risks: Serious adverse reactions, such as the potential for Glaucoma, Cataracts, and Adrenal Suppression (a systemic corticosteroid effect), are primarily associated with the long-term use of the medication.
  • Local Restrictions: Use is formally constrained in the presence of an untreated localized infection involving the nasal mucosa. Regulatory labels also advise caution in patients with recent nasal trauma, surgery, or septal ulcers due to the potential for delayed wound healing.
  • Pediatric Safety: Official safety information notes the potential for reduction in growth velocity in children, requiring periodic monitoring.

Overdose and Emergency Response

Overdose and When to Seek Help

Metaspray (mometasone furoate) is a nasal corticosteroid, and an acute single-event overdose with this type of nasal spray is considered unlikely to cause serious immediate symptoms, often requiring observation only.

However, the primary concern regarding excessive use is prolonged exposure to doses higher than recommended. Long-term use of excessive doses of any nasal corticosteroid can lead to systemic effects due to the medication being absorbed into the body.

Overdose Presentation (Chronic Overuse) Physiological System Affected
Signs or symptoms of hypercorticism Endocrine System
Adrenal suppression Endocrine System

Hypercorticism is a condition resulting from an excess of corticosteroid hormones, while adrenal suppression indicates that the body’s own production of these hormones has been reduced. Monitoring and dosage adjustments by a healthcare provider are important if symptoms of chronic overdose occur.

Emergency Actions:

If a large quantity is swallowed or if prolonged overuse is suspected, you should contact a Poison Control Center or seek medical attention. If you experience serious signs of an allergic reaction (e.g., hives, wheezing, difficulty breathing, swelling of the face, lips, tongue, or throat), seek immediate emergency medical help.

Therapeutic Uses of Metaspray

What Metaspray Treats: Main Uses and Benefits

Metaspray (Mometasone Furoate) is commonly used to help with conditions characterized by periods of heightened symptoms related to inflammatory or irritative states in the nasal passages. This medication may be part of symptomatic management for clusters of symptoms associated with seasonal and perennial allergic rhinitis and is also used for the management of nasal polyps in adults.

It is applied across therapeutic domains where additional symptomatic support is needed to help ease symptoms related to physical discomfort. Common clinical scenarios involve managing symptoms that become temporarily disruptive during flare-ups, such as sneezing, nasal itching, runny nose, and congestion. The treatment supports patients during episodes of heightened discomfort and contributes to easing the overall symptom load.

“It contributes to improved comfort during periods of heightened symptoms, which may help patients cope more steadily with symptom fluctuations.”


Summary: Support for Nasal Symptoms
Focus Conditions Allergic Rhinitis (Seasonal/Perennial), Nasal Polyposis
Symptom Focus Sneezing, Itching, Rhinorrhea, Congestion
Symptomatic Support Contributes to easing the overall symptom load associated with inflammatory or irritative states and assists with maintaining functional stability.

Regulatory References

  1. NIH DailyMed Mometasone Furoate Label

Eligibility and Restrictions for Use

The eligibility to use Metaspray (Mometasone Furoate Nasal Spray) is strictly defined by regulatory authorities based on a patient’s age and current health status. The official label establishes both absolute contraindications and conditional use requirements.

Absolute Contraindications

Use is strictly prohibited for patients with a known hypersensitivity to mometasone furoate or any of its ingredients. The medicine is also contraindicated if there is an untreated localised infection (e.g., Herpes Simplex) in the nasal lining, or if the patient has had recent nasal surgery or trauma until healing has fully occurred, as official regulatory information indicates corticosteroids can inhibit wound repair.

Population and Age Eligibility

Metaspray is approved for treating allergic rhinitis in adults and adolescents (ge 12 years). Eligibility extends to pediatric patients starting from 2 or 3 years of age, depending on the official regional label. However, the safety and efficacy for treating nasal polyps have not been established in patients under 18 years of age.

Conditional Use and Restrictions

Use requires caution in patients with active or quiescent tuberculous infections or other untreated systemic infections (fungal, bacterial, or viral). For pregnant women, use is generally not recommended unless the potential benefit justifies the risk. Caution is also advised during lactation, as it is officially unknown if the medicine is excreted in breast milk.

What should I know about interactions with other medicines?

Interaction Map: Interactions with other medicines and products — official regulatory information for Metaspray

This content is derived exclusively from the interaction sections of government regulatory documents.

Interaction Scope

Category Officially Documented Entity/Restriction
Medicinal product categories with documented interactions Strong Cytochrome P450 3A (CYP3A) Inhibitors
Specific interacting medicines (if explicitly listed) Cobicistat-containing products
Mechanistic basis of interactions (only if stated in label) Pharmacokinetic interaction
Timing-based interaction rules (if applicable) None explicitly specified in official documentation.
Population-specific interaction notes (if applicable) None explicitly stated regarding altered interaction risk in specific populations.
Interaction-related restrictions Co-treatment should be avoided unless the benefit outweighs the increased systemic risk.

Interaction Classifications (High-Level)

Classification Official Regulatory Statement
Interaction severity classification (as defined in official documents) Expected to increase the risk of systemic side-effects (Hypercorticism, Adrenal Suppression).
Regulatory basis (EMA / FDA / etc.) Multiple authorities including EMA-aligned SmPCs and FDA Prescribing Information.
Interaction-context constraints (as defined in official documents) If co-treatment occurs, patients should be monitored for systemic corticosteroid side-effects.

Resulting Interaction Structure

Official interaction statements:

  • Co-treatment with CYP3A inhibitors, including cobicistat-containing products, is expected to increase the risk of systemic side-effects.
  • This combination should be avoided unless the clinical benefit is determined to outweigh the officially documented increased risk of systemic corticosteroid side-effects.
  • When co-administration is necessary, patients should be monitored for the development of systemic corticosteroid effects, such as Hypercorticism and Adrenal Suppression.

Connection to the overall interaction profile: Regulatory documents define the product's interaction structure primarily through a pharmacokinetic mechanism involving the CYP3A enzyme system, which leads to an official restriction that the co-administration of these substance categories is to be avoided due to the documented potential for increased systemic corticosteroid exposure.

Mechanism of Action

The action of Mometasone Furoate is rooted in its pharmacodynamic mechanism as a synthetic glucocorticoid agonist. Its effects are cellular and localized, achieved by systematically interrupting the biochemical cascade that drives the inflammatory response in the nasal passages.

Genomic Modulation: The Intracellular Receptor Mechanism

This domain covers the drug's primary action on the Glucocorticoid Receptor (GR), a protein found inside nasal cells. By binding to the GR, Mometasone Furoate controls the cell's genetic output, initiating transrepression to suppress genes that produce pro-inflammatory signals like cytokines and chemokines. This molecular control alters the cellular machinery, resulting in the modulation of the inflammatory response.


Cascade Inhibition and Vascular Control

The genomic action promotes anti-inflammatory proteins, such as Lipocortin-1, which results in the inhibition of the PLA2 enzyme. This key step prevents the formation of inflammatory mediators like prostaglandins and leukotrienes. Mechanistically, this suppression, combined with localized vasoconstriction, restricts the permeability of local capillaries. The physiological consequence is a reduction in extravasated plasma fluid and cellular infiltration, which regulates mucosal volume and secretory output.


Mechanistic Onset Constraint

Because the drug's core mechanism requires the time-consuming processes of gene transcription and protein synthesis, its full physiological effect is not immediate. The onset of action is thus inherently constrained; the anti-inflammatory effect builds up gradually, requiring continuous modulation to achieve maximum tissue stabilization.

Dosage and Administration Information

Administration Guidelines for Metaspray (Mometasone Furoate)

Metaspray is a nasal spray suspension for intranasal use only and must be administered according to the provided dosing and procedural instructions. The correct use involves preparation of the device and adherence to an age- and condition-specific dosing schedule.

Preparation and Procedure

Before the first dose, the bottle must be shaken well. The pump requires priming by actuating 10 times until a fine spray is observed. If the spray device has not been used for 7 days or longer, it must be re-primed by actuating 2 times. The procedural steps are:

  1. Shake the container well before each use.
  2. Prime the pump if it is a new bottle or has not been used for at least one week.
  3. Insert the tip into the nostril and administer the prescribed number of sprays while inhaling gently.
  4. Avoid spraying the suspension into the eyes or mouth, as the product is only intended for the nasal passages.

Dosing Schedule

The frequency is typically once daily or twice daily, depending on the specific condition being treated, with no timing constraints related to meals.

Age Group Condition Recommended Dose (per day)
Adults (18+ years) Nasal Polyps 2 sprays in each nostril, twice daily (400 mcg total)
Adults & Adolescents (12+ years) Allergic Rhinitis (Treatment/Prophylaxis) 2 sprays in each nostril, once daily (200 mcg total)
Children (2-11 years) Allergic Rhinitis (Treatment) 1 spray in each nostril, once daily (100 mcg total)

Missed Dose Instructions

If a dose is missed, it is generally recommended to apply the dose as soon as it is remembered. However, if it is almost time for the next scheduled dose, the missed dose should be skipped entirely; the patient should not double the dose to compensate. For prophylaxis of seasonal allergic rhinitis, treatment should begin approximately 2 to 4 weeks prior to the anticipated start of the pollen season to achieve maximum therapeutic effect.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Metaspray

This overview describes the types of clinical studies that have been conducted for Mometasone Furoate Nasal Spray. It focuses on what research has explored, what outcomes were measured, and where evidence limitations exist, without giving any personal medical advice or making claims about what the medicine will do for you.


Evidence for Use in Allergic Rhinitis (Seasonal and Perennial)

The core evidence for allergic rhinitis consists of numerous Randomized Controlled Trials (RCTs) comparing an active group against a placebo. These short-term studies explored outcomes related to physical discomfort, primarily using patient-reported outcomes describing perceived discomfort (TNSS). Studies monitored key symptoms (sneezing, itching, congestion) over short time intervals (2 to 4 weeks) and report how symptoms evolved in the observed populations.

Evidence for Use in Nasal Polyps

Research for nasal polyps was evaluated in the adult population in controlled studies. These studies examined objective evidence using a Physician-assessed Polyp Grade Score (a physical measure) and subjective patient-reported outcomes describing perceived discomfort (congestion). Research observed responses over defined time intervals, documenting measurements over periods of up to four months.


Long-Term Studies and Durability of Follow-up

The majority of controlled comparisons was observed over a few weeks. Studies also monitored symptom patterns for up to 12 weeks or longer, particularly for perennial rhinitis. These longer-term follow-up studies were often observational, monitoring the long-term patterns observed in the studies. Highly controlled, long-term research is not as extensive as the short-term evidence.

Evidence in Special Populations and Research Gaps

Research has specifically examined the populations of children (aged 2 to 11) and adolescents with allergic rhinitis. Data for certain groups remain insufficient (such as the elderly or pregnant individuals), as these groups are often excluded from initial trials, meaning specific research is limited. Because core efficacy trials are short-term, long-term effects are not fully established. Certainty remains low in areas where findings rely heavily on subjective outcomes (TNSS), and comparative evidence is lacking.

Key Studies & References

  1. Mometasone Furoate Nasal Spray, USP: DailyMed Label Information

Frequently Asked Questions (FAQ)

Common questions about Metaspray (FAQ)


Q: How long does it usually take to feel the effects of Metaspray?

Official information indicates that some reduction in symptoms may be experienced as soon as 12 hours after the first use. However, the medicine works by reducing inflammation gradually, so the full therapeutic benefit usually requires consistent, regular use over a period of several days or up to 1 to 2 weeks.


Q: Is it possible to become dependent on Metaspray if I use it for a long time?

Regulatory documentation does not suggest a risk of addiction or physical dependency in the typical sense. However, long-term use of this class of medicine is associated with a documented risk of systemic side effects, such as Hypercorticism and Adrenal Suppression, which relate to how the body produces its own natural steroid hormones. Regulatory documents indicate that long-term use requires monitoring for potential systemic effects.


Q: Does Metaspray cause drowsiness or make you feel tired?

The active ingredient in Metaspray, mometasone furoate, has not been associated with drowsiness in its approved nasal spray form according to official safety information. Official safety documents for this product do not list drowsiness or fatigue as commonly reported side effects.


Q: Is Metaspray safe to use during pregnancy or while breastfeeding?

Official documents state that there is limited data on use in pregnant women. Use during pregnancy is generally not recommended unless the potential benefit is judged to justify the potential risk, due to limited data. It is also not known if the active ingredient passes into breast milk, and caution is advised during breastfeeding.


Q: What is the difference between Metaspray and other allergy nasal sprays?

Metaspray is classified as a glucocorticoid (a type of corticosteroid), which acts locally inside the nose to suppress the underlying mechanisms of the inflammatory response. This mechanism of action differs from other types of nasal sprays, such as decongestants, which shrink blood vessels, or antihistamine sprays, which block the action of histamine.


Q: Can Metaspray cause nosebleeds, and how common is this?

Yes, nosebleeds (known medically as Epistaxis) are listed in official safety documents as a commonly reported adverse reaction for this medicine. It is one of the most frequent local side effects noted in clinical trials.


Q: Can I use Metaspray along with an oral antihistamine tablet?

Official documents have not identified any clinically significant drug-drug interactions between mometasone furoate and common non-prescription medicines like oral antihistamines. The medicine's active ingredient has low systemic absorption, meaning little of it enters the bloodstream to interact with other medicines.


Q: Are there any long-term health concerns from using Metaspray daily?

Official documents mention that long-term daily use of this type of medicine is associated with documented concerns. These include the potential for eye-related issues like Glaucoma or Cataracts, as well as the potential for Adrenal Suppression. Due to these potential risks, monitoring is required for extended use, as noted in official documents.


Q: Does Metaspray interact with common supplements like vitamin C or zinc?

Regulatory documents prioritize warnings for medicines that interact with the CYP3A enzyme system, such as certain antiviral or antifungal drugs. Official sources have not identified any clinically significant interaction warnings related to common nutritional supplements like Vitamin C or Zinc.


Q: How long is a bottle of Metaspray good for after the first time it's used?

To maintain quality and effectiveness, the product label instructs that the bottle must be discarded two months after it is first opened. You should also discard it once the labeled number of metered sprays has been used up, whichever comes first.


Q: Can people with glaucoma or cataracts use Metaspray?

Regulatory guidance highlights that individuals who currently have or have previously had glaucoma or cataracts should consult with a healthcare professional regarding the use of this product. This is because long-term use of this medicine class has been associated with these conditions.


Q: Why is it described that Metaspray needs consistent daily use?

The medicine works by modulating the inflammatory process at a cellular level, which is a gradual process. Because the full therapeutic effect is not immediate, continuous, daily use is necessary to build up and maintain the level of anti-inflammatory effect needed for symptom control.


Q: Is Metaspray a locally acting treatment or does it go throughout the body?

Metaspray is designed to be a locally acting treatment. Pharmacokinetic studies show that the active ingredient has very low systemic bioavailability (less than 1% absorbed into the bloodstream), indicating it primarily acts only on the nasal lining.


Q: Can I share my Metaspray with someone else if they have similar symptoms?

Official patient instructions advise not to share the container with anyone else. This instruction is in line with general hygiene practices for personal prescription devices.


Q: Is it true that Metaspray is used to shrink polyps in the nose?

Yes, official documents indicate that the medicine is approved for the treatment of nasal polyps in certain adult patient populations. Clinical trials have monitored changes in polyp size and patient-reported symptoms when the medicine is used for this indication.


Q: Why does Metaspray need to be shaken before each use?

The product is prepared as a suspension, meaning the active medicine is dispersed in the liquid rather than dissolved. Directions mandate that the bottle be shaken well before each use to ensure the medicine is evenly mixed and that the proper amount is delivered with every spray.


Q: Is it normal to have a strange smell or taste after using Metaspray?

An unpleasant taste or smell is an adverse reaction that has been noted in the official safety information for this product. This is an adverse reaction noted in the official safety information. Any persistent or bothersome effects should be discussed with a healthcare professional.


Q: Does using Metaspray affect my eyes or vision?

Long-term use of this class of medicine is officially associated with the potential for developing rare adverse reactions such as Glaucoma or Cataracts. The product's administration instructions also advise users to avoid spraying the suspension directly into the eyes.


Q: Can people who are sensitive to alcohol use Metaspray?

The product formulation does not contain ethanol (drinking alcohol). However, it does contain benzalkonium chloride as a preservative, which is listed in official documents as an ingredient with a known effect.


Q: Does the use of Metaspray affect my sense of smell?

A change in the sense of smell is a documented adverse reaction that has been reported in post-marketing or other official safety information for the active ingredient.


Q: Is Metaspray effective for pet allergies?

The medicine is officially indicated for the relief of nasal symptoms associated with perennial allergic rhinitis. Perennial allergies include year-round triggers such as dust mites and pet dander, meaning the indications include perennial symptoms potentially caused by allergens such as pet dander.


Q: Why do some people say they felt worse when they first started Metaspray?

Official patient information notes that a temporary sensation of stinging or irritation may occur in the nose for a few seconds immediately after the spray is administered. This temporary discomfort is a known local effect documented in patient materials.


Q: Does Metaspray contain any ingredients derived from animals?

The list of non-active ingredients, or excipients, in the product formulation does not contain any ingredients that are commonly derived from animals.

How should Metaspray be stored and disposed of?

How to Store and Dispose of Metaspray?

The storage and disposal of Metaspray (mometasone furoate) Nasal Spray must adhere strictly to labeled regulatory requirements to maintain product stability and safety.


Storage Conditions and Stability

  • Temperature and Freezing: The product should be stored below 25 C or 30 C and must not be frozen.
  • Protection: The container must be kept tightly closed and protected from light and excess moisture.
  • Child Safety: The medication must be kept out of the sight and reach of children.
  • Post-Opening Limit: The bottle must be discarded two months after it is first opened, or once the labeled number of metered sprays has been used.

Disposal Instructions

Unused or expired product must be disposed of in accordance with local requirements.

  • Preferred Method: Disposal is best achieved through a formal drug take-back program.
  • Environmental Safety: The product must not be thrown into wastewater or allowed to enter the sewage system.

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

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