Xola

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Xola

Treatment option: Hypertension, Glaucoma

Medically reviewed

Marina Burgos

Last updated on 22/12/2025

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

Overview of Xola

What is Xola?

Xola is a pharmaceutical medication containing the active ingredient omalizumab. It belongs to a class of drugs known as monoclonal antibodies. These are proteins designed to recognize and bind to specific targets in the body to modify the immune response.

Mechanism of Action

The primary function of Xola is to target and bind to immunoglobulin E (IgE), an antibody naturally produced by the immune system. IgE plays a central role in the body's allergic response. By binding to circulating IgE, Xola prevents it from attaching to receptors on the surface of specialized immune cells, such as mast cells and basophils.

When IgE is blocked in this manner, these immune cells are less likely to release chemical mediators like histamine. The reduction of these chemicals helps to decrease the underlying inflammation and the physiological reactions typically associated with allergic and certain inflammatory conditions.

Clinical Applications

Xola is utilized in the management of chronic conditions where IgE-mediated pathways contribute to symptoms. It is most commonly used in the following areas:

  • Asthma Management: It is used for individuals with persistent asthma that is triggered by year-round allergens, particularly when symptoms remain uncontrolled despite the use of standard inhaled treatments.
  • Chronic Spontaneous Urticaria (CSU): It is used to treat chronic hives that occur without an identifiable cause and do not respond sufficiently to antihistamines.
  • Nasal Polyps: It may be used as an add-on treatment for adults with chronic rhinosinusitis with nasal polyps when standard corticosteroid treatments do not provide adequate relief.

Unlike rescue medications, Xola is a long-term maintenance therapy intended to reduce the frequency and severity of symptoms over time.

What side effects are possible with Xola?

Possible Side Effects and Safety Information

The safety profile of Xola (Dorzolamide Hydrochloride Ophthalmic Solution) is structured by the frequency of reported adverse reactions and the potential for systemic effects related to its classification as a sulfonamide derivative.


Adverse Reaction Classifications

The most frequently observed adverse reactions are generally localized to the eye. Regulatory documents classify these effects by frequency:

Frequency Examples of Adverse Reactions (by System-Organ Class)
Very Common Ocular burning and stinging or discomfort.
Common Headache, taste perversion (bitter/unusual taste), superficial punctate keratitis, conjunctivitis, lid reactions, blurred vision, and fatigue.
Rare Iridocyclitis, transient myopia, skin rashes, urolithiasis (kidney stones), and epistaxis (nosebleeds).

Systemic Risk and Safety Restrictions

Because Dorzolamide is absorbed systemically, regulatory documents caution that the severe, though rare, adverse reactions associated with oral sulfonamide drugs may potentially occur. This classification includes serious reactions such as Stevens-Johnson syndrome, Toxic Epidermal Necrolysis, and certain blood disorders (e.g., aplastic anemia).

Specific regulatory constraints exist for certain patient groups. The medicine is not recommended for use in individuals with severe renal impairment (creatinine clearance < 30 mL/min). Caution is also advised when prescribing to patients with hepatic impairment, as studies in this group are limited. Furthermore, co-administration with other oral carbonic anhydrase inhibitors is not recommended due to the potential for additive systemic effects from the drug class.

Overdose and Emergency Response

Overdose: What to Know About Xola

This section describes the official regulatory information regarding a suspected overdose of Xola (Dorzolamide), based on documentation from governmental health agencies.


When to Seek Immediate Medical Help

If a suspected overdose of Xola occurs, immediate medical attention is required. The primary concern is the potential for systemic effects related to the medication’s properties as a carbonic anhydrase inhibitor.

Key symptoms that may present in the event of an overdose include electrolyte imbalance, a significant change in the body's acid-base balance leading to acidosis, and possible central nervous system effects.


Official Overdose Response

In the event of an overdose, regulatory guidance mandates specific emergency actions focused on stabilization and monitoring:

  • Monitoring: The patient's serum electrolyte levels (specifically potassium) and blood pH levels must be closely monitored to assess the severity of the imbalance.
  • Supportive Treatment: Any documented symptoms, such as electrolyte imbalance, acidosis, or CNS effects, should be addressed with appropriate supportive treatment by healthcare professionals.

Do not delay seeking emergency care if an overdose is suspected, even if symptoms appear mild, as the necessary monitoring and treatment are time-sensitive.

Therapeutic Uses of Xola

Quick Facts: What Xola Treats

  • Supports control of moderate-to-severe persistent allergic asthma in patients whose symptoms are not adequately managed by inhaled corticosteroids.
  • Used as an add-on treatment for chronic spontaneous urticaria (hives) in patients who remain symptomatic despite standard H1 antihistamine therapy.
  • Indicated as an add-on maintenance treatment for chronic rhinosinusitis with nasal polyps in adults with inadequate response to nasal corticosteroids.
  • May be used to reduce allergic reactions, including the risk of anaphylaxis, that may occur with accidental exposure to one or more foods in patients aged 1 year and older, alongside continued food allergen avoidance.

Xola is a prescription medication utilized in managing certain allergic and inflammatory conditions. It is indicated to support the control of moderate-to-severe persistent allergic asthma in specific adult and pediatric populations who continue to experience symptoms despite treatment with inhaled corticosteroids. Xola is a component of a comprehensive treatment plan for these patients.

Additionally, Xola serves as an add-on therapy for individuals with chronic spontaneous urticaria (hives) when symptoms persist following treatment with H1 antihistamines. In adults, Xola is also utilized as an add-on maintenance treatment for chronic rhinosinusitis with nasal polyps when an inadequate response to nasal corticosteroids is observed.

Furthermore, Xola has an authorized use for the reduction of allergic reactions, including reducing the risk of anaphylaxis, in adult and pediatric patients with IgE-mediated food allergy following accidental exposure to one or more foods. This medication should be used in conjunction with complete food allergen avoidance measures.

Eligibility and Restrictions for Use

Who Can and Cannot Use Xola?

Eligibility for Xola (Dorzolamide) is strictly governed by population rules defined in official regulatory labeling. Use is permitted for adults and pediatric patients aged 2 years and older. Safety and effectiveness are not established for children under two years of age.


Absolute Contraindications

Official documents state that Xola must not be used by certain populations. This includes patients with a known hypersensitivity to the active ingredient, other sulfonamides, or any formulation component. Use is also contraindicated in patients with severe renal impairment (creatinine clearance less than 30 mL/min) and those with hyperchloraemic acidosis.


Restricted and Conditional Use

Certain groups require restricted or conditional use, often specified as use with caution:

  • Hepatic Impairment: Patients with liver disease (hepatic impairment) should use Xola with caution, as studies are limited in this population.
  • Kidney History: Individuals with a history of renal calculi (kidney stones) should be monitored.
  • Ocular Surgery: Patients with pre-existing chronic corneal defects or a history of intraocular surgery should use the medicine cautiously.
  • Concomitant Therapy: Concomitant administration with an oral Carbonic Anhydrase Inhibitor is not recommended.

Pregnancy and Lactation

Use during pregnancy is not recommended unless essential, due to insufficient human data. For lactating/breastfeeding mothers, use is not recommended.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Xola (Dorzolamide hydrochloride) primarily addresses interactions arising from its systemic absorption and procedural rules for co-administration.

Pharmacodynamic and Systemic Interactions

Co-administration with oral Carbonic Anhydrase Inhibitors is officially not recommended in regulatory documents. This constraint is based on the potential for an additive systemic effect resulting from enhanced carbonic anhydrase inhibition. Furthermore, the combination of Xola with high-dose salicylate therapy is associated with a pharmacodynamic toxicity risk, specifically citing the potential for clinically significant acid-base and electrolyte disturbances.

Administration Timing and Constraints

A mandatory timing rule applies when Xola is used concurrently with other topical ophthalmic drug products. To ensure adequate drug exposure and prevent washout, a strict separation of at least five minutes is required between the administration of Xola and any other eye drop medication.

Population-Specific Restrictions

Xola carries a formal contraindication in the population of patients with severe renal impairment (creatinine clearance less than 30 ml/min). This restriction is explicitly noted in official labeling due to the risk of systemic accumulation of Dorzolamide and its active metabolite, which rely predominantly on kidney function for clearance.

Mechanism of Action

How Xola Works: Blocking the Ciliary Enzyme

Xola works by acting as an inhibitor of the Carbonic Anhydrase (CA) enzyme, primarily targeting the isozymes located in the eye's ciliary processes. By binding to this enzyme, Xola prevents the CA-mediated catalysis required for the formation of bicarbonate ions ( HCO3^-) and protons ( H^+), a critical early step in the fluid generation process. This mechanism is focused on modulating ocular fluid production via an enzymatic block.


The Cascade to Lowered Eye Pressure

Inhibiting Carbonic Anhydrase interrupts the formation of bicarbonate ions and protons, which are essential for active transport. This mechanistic cascade leads to a reduction in the secretion of sodium ions ( Na^+) and water ( H2 O) into the posterior chamber, directly modulating ocular fluid dynamics. This results in a physiological decrease in the volume of aqueous humor and a subsequent reduction in intraocular pressure (IOP).

Dosage and Administration Information

Administration Overview

Xola is typically administered by a healthcare professional in a clinical setting. The process involves a subcutaneous injection, which is a delivery method into the fatty tissue layer located just beneath the skin.

Injection Sites

Common areas for subcutaneous administration include:

  • Upper Arms: The fleshy outer area of the arm.
  • Thighs: The front or outer portion of the thigh.
  • Abdomen: The stomach area, avoiding the immediate region around the navel.

Preparation and Handling

The product is generally supplied as a solution or a powder that requires reconstitution. Healthcare providers ensure the liquid is clear and free of particulate matter before use. If the product has been refrigerated, it is standard practice to allow it to reach room temperature naturally before administration to minimize discomfort during the injection.

Monitoring

Because this administration occurs in a medical environment, patients are usually monitored for a period of time following the injection. This observation period allows healthcare providers to oversee the initial response to the administration.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Xola (Dorzolamide)

This section provides a factual overview of the clinical research that defines the use of Xola, focusing strictly on the structure and scope of the studies, without providing advice, interpretation, or clinical guidance. The evidence summarized here is derived from authoritative governmental and peer-reviewed scientific sources.


Evidence for Use in Managing Elevated Intraocular Pressure (IOP)

The fundamental evidence for Xola has been gathered through short-term, randomized controlled trials (RCTs) and systematic reviews. This research approach is standard for evaluating medications intended for managing conditions such as open-angle glaucoma (OAG) and ocular hypertension (OH). The primary outcome research examined was the change from baseline in mean IOP. These studies monitored the IOP measurements at specific time points throughout the day.

The trials explored how these pressure measurements developed when Xola was administered. Data show patterns related to the measurements when compared against both an inactive substance (placebo) and active comparators.


Long-Term Studies and Maintenance of Effect

To document the sustained nature of the measurements over time, researchers monitored patients in long-term open-label extension studies. These trials research describes the findings related to IOP measurements over defined time intervals, sometimes extending up to a year or more. A significant portion of the evidence detailing the long-term measurements was associated with research involving a fixed-combination product (Dorzolamide combined with another medicine) rather than Xola used as a single ingredient alone.


Evidence Gaps and Areas of Research Uncertainty

Evidence is limited for patients with severe renal impairment or significant hepatic impairment. Furthermore, long-term effects are not fully established for Xola as a standalone treatment. Research is lacking regarding the use of Xola in the clinical situation of acute angle-closure glaucoma. Research provides context but not individual predictions regarding these specific situations.

Frequently Asked Questions (FAQ)

Common questions about Xola (FAQ)

Q: How should Xola be stored?

A: The official product information states that Xola ophthalmic solution should be kept at controlled room temperature, typically between 20 C to 25 C (68 F to 77 F). To maintain its quality, the medicine must also be protected from light.

Q: What are the ingredients in Xola other than the main medicine?

A: Xola ophthalmic solution contains the active ingredient, Dorzolamide hydrochloride, which is the medicine that works to reduce eye pressure. It also contains several inactive ingredients (excipients) necessary for the solution’s formulation and stability, such as Sodium Citrate and Benzalkonium Chloride (a preservative).

Q: What is the difference between Xola and a generic drug with the same active ingredient?

A: According to regulatory standards, Xola and its authorized generic versions contain the identical active ingredient, Dorzolamide hydrochloride, in the same concentration. This means the medicine itself is the same, while the other ingredients and packaging may vary.

Q: Is Xola the same as [Competitor Drug Name]?

A: Official information indicates that Xola is a Topical Carbonic Anhydrase Inhibitor (CAI) with the active ingredient Dorzolamide. While other medicines may belong to the same drug class or treat the same condition, they possess different active ingredients.

Q: If I have a history of heart issues, can I take Xola?

A: The official regulatory documents for Xola (Dorzolamide as a single-ingredient product) do not list a history of heart issues or cardiac failure as a contraindication (a reason to absolutely avoid use). Information related to specific medical history must always be discussed with a healthcare professional.

Q: Why does Xola need a prescription?

A: Xola is classified as a prescription-only medication because it belongs to the Carbonic Anhydrase Inhibitor drug class and requires clinical supervision. A licensed healthcare professional monitors its effect on intraocular pressure ( IOP) and assesses appropriate use conditions.

Q: Are there specific monitoring tests required when taking Xola?

A: Yes, authoritative sources indicate that periodic eye tests and other evaluations are typically ordered by a healthcare professional. These monitoring tests are necessary to check the therapeutic response and ensure the medication is working as expected.

Q: Are there generic versions of Xola available?

A: The active ingredient in Xola, Dorzolamide hydrochloride, has been approved in generic versions by regulatory authorities. This means that generic options containing the same medicine may be available on the market.

Q: Does Xola interact with common pain relievers like ibuprofen?

A: Regulatory documents do not specifically list common pain relievers like ibuprofen. However, official guidance cautions against co-administration with high-dose salicylate therapy (e.g., aspirin) due to a potential risk for acid-base and electrolyte disturbances.

Q: Can Xola be taken long-term?

A: The typical prescribed course for Xola is continuous and long-term to maintain pressure control. While clinical research has documented the maintenance of pressure measurements for up to one year, official documents state that the long-term effects of Xola as a standalone treatment are not fully established.

Q: Does taking Xola make you tired or drowsy?

A: Official regulatory documents list fatigue as a common adverse reaction that may be experienced with Xola use. This is a general feeling of tiredness or lack of energy.

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

A: The active ingredient in Xola is absorbed systemically and is predominantly eliminated via the kidneys. Its clearance involves both the drug and an active metabolite, and the time required for full clearance can vary among individuals.

Q: Is Xola safe to take during pregnancy?

A: Use during pregnancy is not recommended unless a healthcare professional determines that the potential benefit outweighs the potential risk. This caution is stated in official documents due to insufficient human data regarding the potential risks of the medication during pregnancy.

Q: What should I do if I experience an uncommon side effect from Xola?

A: Official patient guidance advises that if serious or unusual reactions occur, including signs of hypersensitivity or severe skin reactions, the use of the product should be discontinued. Consultation with a healthcare professional is appropriate when experiencing an uncommon side effect.

Q: Does Xola affect fertility?

A: Nonclinical toxicology studies performed in animals noted effects on fertility in male rats when given high systemic exposures of the drug. The significance of this finding related to fertility in human use is not established.

Q: What is the maximum amount of time Xola has been studied in clinical trials?

A: Efficacy studies for Xola as a single ingredient have documented the pressure-lowering effect for periods of up to one year. This duration establishes the sustained effect over a long period.

Q: Can teenagers or children take Xola?

A: Official documents specify that Xola is approved for use in adults and in pediatric patients who are 2 years of age and older. Safety and effectiveness are not established for children younger than two years old.

Q: Is Xola known to cause any skin reactions or rashes?

A: Yes, skin reactions, including rashes, are listed as rare adverse reactions. Because the medicine is a sulfonamide derivative, there is a potential for rare, severe systemic skin reactions, such as Stevens-Johnson syndrome.

Q: What is the risk of an allergic reaction to Xola?

A: Hypersensitivity (an allergic response) to the drug or other sulfonamides is listed as an absolute contraindication. Allergic-type reactions in the eye have been reported, and if serious signs of hypersensitivity occur, discontinuation is officially advised.

Q: Is it possible to become dependent on Xola?

A: The official prescribing information does not contain a section on abuse and dependence. The regulatory documents do not list the potential for dependence or abuse related to Xola.

Q: Does Xola cause weight gain?

A: Weight gain is not listed among the commonly or rarely reported adverse reactions documented in official regulatory safety information for Xola.

Q: How long does it typically take for Xola to start working?

A: Studies and official information indicate that the onset of the pressure-lowering effect in the eye is typically noted within one to two hours following administration of the eye drop solution.

Q: Does Xola require special instructions for disposal?

A: The medicine should be safely disposed of when it is out of date or no longer needed. Official guidance related to the product indicates following standard procedures for storing medication safely out of the reach of children.

Q: What is the difference between Xola and a placebo in research trials?

A: Clinical studies compared Xola against an inactive substance (placebo). The research findings reported an IOP-lowering effect of approximately 3 to 5 mmHg (millimeters of mercury) when compared to baseline or placebo measurements.

Q: Does Xola have a black box warning from the FDA?

A: A Boxed Warning, which is often referred to as a 'Black Box Warning', is not present on the current official FDA labeling for Xola. However, the label does include a separate WARNINGS section detailing the potential for serious adverse reactions associated with sulfonamides.

How should Xola be stored and disposed of?

XOLA (omalizumab) must be stored under refrigeration at 2 C to 8 C (36 F to 46 F) and must not be frozen. The product should remain in its original carton to protect it from light. The total combined time XOLA is removed from refrigeration should not exceed 48 hours (2 days). XOLA must be stored out of the reach of children. Used syringes and autoinjectors are considered sharps and must be disposed of immediately in an FDA-cleared sharps disposal container. Sharps must not be placed in household trash or recycling bins; follow local regulatory guidelines for final disposal of the full container. Do not use XOLA if it is past its expiration date or appears damaged.

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

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