Pulmozyme

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Pulmozyme

Method of action: Expectorant

Treatment option: Cystic Fibrosis

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 Pulmozyme

Property Description
Active Ingredient Dornase alfa (recombinant human deoxyribonuclease I)
Form Solution for inhalation (single-use ampules)
Pharmacological Class Mucolytic Agent; Recombinant Enzyme
General Purpose To improve respiratory function by thinning lung secretions
Origin Biosynthetic (Recombinant DNA technology)

What Type of Medicine is Pulmozyme (Dornase Alfa)?

Pulmozyme is the brand name for the prescription-only medication containing the active ingredient dornase alfa, which is classified as a highly specialized mucolytic agent and a recombinant enzyme. This specialized drug functions as a protein-based therapy with the general purpose of helping patients manage conditions characterized by chronically thick, persistent lung secretions, contributing to generalized improvement in pulmonary function. Dornase alfa is structurally a clone of deoxyribonuclease I (DNase I), a natural human enzyme. It is a recombinant human deoxyribonuclease used for reducing mucus viscosity. This medicine works specifically on the physical properties of the secretions to make breathing easier for patients.

Composition: Is Dornase Alfa Natural or Biosynthetic?

Dornase alfa is a biosynthetic compound, meaning it is produced using recombinant DNA technology rather than being chemically synthesized. This sophisticated process involves growing the gene in genetically engineered Chinese Hamster Ovary (CHO) cells to yield a highly pure form of the enzyme, technically known as recombinant human deoxyribonuclease I (rhDNase). This enzyme targets the DNA in the mucus, which is the main factor responsible for its thickness. The medication is prepared exclusively as a sterile aqueous solution for inhalation, which is designed to be converted into an aerosol mist via a nebulizer. This specific pulmonary route of administration ensures the active agent reaches the impacted airways, reducing the viscoelasticity of the secretions.

What side effects are possible with Pulmozyme ?

Possible Side Effects and Safety Information

This section outlines the officially documented adverse reactions and safety-related information for Pulmozyme (dornase alfa), strictly based on governmental regulatory documents.


Safety Restrictions and Limitations

Pulmozyme is contraindicated in patients with a known hypersensitivity or allergy to dornase alfa, Chinese Hamster Ovary (CHO) cell products, or any component of the drug product. This is the single absolute contraindication stated in regulatory documents.

Frequency of Adverse Reactions

The most commonly documented adverse reactions are those that occurred at an incidence of 3% or more than in patients receiving placebo during clinical trials. These reactions are typically mild and transient, affecting several body systems.

Commonly Documented Adverse Reactions (ge3% more than placebo):

System-Organ Class Adverse Reaction Examples
Respiratory Pharyngitis, voice alteration, laryngitis, rhinitis, decrease in lung function, chest pain.
General Fever, rash, conjunctivitis.
Gastrointestinal Dyspepsia.

Allergic Reactions

Regulatory documents note that while mild to moderate hives and a mild, transient skin rash have been observed, there have been no reports of severe allergic reactions (anaphylaxis) attributed to dornase alfa.

Population-Specific Safety

Safety data is available for pediatric patients as young as 3 months to less than 5 years. In this youngest group, a higher incidence of cough and rhinitis was observed compared to children aged 5 years and older. Additionally, a small percentage of patients (approximately 2–4%) developed serum antibodies to dornase alfa during clinical studies.

Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory profile for Pulmozyme (dornase alfa) overdose is dictated by the drug’s physical characteristics, namely its very limited systemic absorption and short half-life following inhalation. Based on these properties, systemic toxicity is not expected and has not been observed, even in clinical scenarios involving high-dose exposures.

Regulatory documentation confirms that patient exposure up to 20 mg twice daily—which represents sixteen times the standard daily dose—was tolerated well for periods of up to six days. Consistent with this observation, no specific toxic clinical manifestations or severe life-threatening outcomes are documented in official labeling, and it is explicitly stated that systemic treatment of overdose is unlikely to be necessary.

The official guidance on over-exposure requires that a medical professional be consulted for advice immediately if the medication is used in excess of the recommended amount. This requirement for professional oversight is necessary despite the low expected toxicity. This immediate consultation may involve contacting a National Poisons Centre for structured guidance on the management of the over-exposure, ensuring appropriate action is taken according to established clinical protocols. The structure of this guidance emphasizes consultation over specific procedural steps.

Therapeutic Uses of Pulmozyme

What Pulmozyme Treats: Main Uses and Benefits

Pulmozyme (dornase alfa) is a specialized, long-term maintenance therapy commonly used to manage the primary pulmonary complications associated with Cystic Fibrosis (CF) in both adult and pediatric patients. It is applied in the management of CF where it may assist with easing the symptomatic burden related to thick airway secretions and is considered relevant for supporting pulmonary function. It is relevant for use in therapeutic protocols, helping to manage symptoms linked to hyperviscous airway secretions, impaired sputum clearance, and the resulting risk of pulmonary exacerbations. The medication is characterized as relevant for supporting lung function in CF patients.


Therapeutic Focus and Patient Benefit

The primary therapeutic benefit is commonly used to help with easing the symptomatic burden related to thick, sticky mucus. Sustained use contributes to easing the overall symptom load and may assist with supporting pulmonary function measurements over time. This approach is relevant for managing the symptomatic burden in situations involving various levels of symptomatic burden.

“The therapy is considered relevant for managing symptoms that interfere with daily comfort and may assist with maintaining functional stability.”

Quick Fact: Relief for Hyperviscous Airway Secretions Pulmozyme may assist with managing the risk factors associated with severe respiratory tract infections that arise from chronic secretion buildup. The therapy contributes to easing the overall symptom load and supports general well-being during symptomatic phases.

Regulatory References

  1. Dornase Alfa: MedlinePlus Drug Information

Eligibility and Restrictions for Use

Official Eligibility Rules for Pulmozyme (Dornase Alfa)

Pulmozyme is intended for use exclusively by Cystic Fibrosis (CF) patients to help improve pulmonary function, as established in regulatory documents. Eligibility is defined by both the patient's underlying disease and absolute exclusion criteria.


Populations for Whom Use is Established

Population Category Eligibility Status (Regulatory Basis)
Primary Indication Patients with a confirmed diagnosis of Cystic Fibrosis
Age Group Use is established in patients 3 months of age and older
Pulmonary Function Indicated for all CF patients; specific benefit documented for those with FVC ge 40% of predicted

Absolute Contraindications

Pulmozyme must not be used in patients with a known hypersensitivity to the active ingredient, dornase alfa. Contraindication also applies to patients with hypersensitivity to Chinese Hamster Ovary (CHO) cell products or any other component of the formulation, as stated in the official labeling.


Use in Specific Populations

Population Category Regulatory Status
Infants Use is not established in infants younger than 3 months of age
Pregnancy/Lactation Caution is recommended due to a lack of adequate and well-controlled human studies; the presence in human milk is unknown.

No specific restrictions or dosage adjustments for renal or hepatic impairment are detailed in the official regulatory labeling.

What should I know about interactions with other medicines?

Interactions with Other Medicines and Products

Official regulatory data indicates that Pulmozyme (dornase alfa) does not have any documented clinically important drug-drug interactions that affect the body's processing (pharmacokinetics) of the medicine. Its mechanism of action, which is local within the lungs, results in minimal systemic exposure, largely preventing systemic drug interactions.

However, a crucial procedural restriction is documented in official labeling regarding its administration. Pulmozyme is not to be diluted or mixed with any other drug or solution in the nebulizer bowl during administration. This restriction is necessary because combining Pulmozyme with other substances could potentially lead to adverse physicochemical or functional changes in Pulmozyme or the admixed compound, diminishing its effectiveness or altering the characteristics of the solution.

Pulmozyme has been routinely administered in clinical practice alongside standard therapies for cystic fibrosis without any documented systemic interaction concerns. This includes co-administration with oral, inhaled, and/or parenteral antibiotics, bronchodilators, enzyme supplements, vitamins, oral or inhaled corticosteroids, and analgesics. The core of its interaction profile is the lack of systemic interactions coupled with the strict requirement to keep the inhalation solution unmixed within the nebulizer device immediately prior to inhalation.

Mechanism of Action

Targeted Enzymatic Cleavage of Extracellular DNA

The active ingredient, dornase alfa, functions as a specialized recombinant human deoxyribonuclease I (rhDNase) enzyme. This enzyme selectively targets and chemically dismantles a single component of purulent respiratory secretions: the extracellular DNA (eDNA). This eDNA, released from the nuclei of degenerating inflammatory cells (neutrophils), forms the highly viscous, structural scaffold of thick mucus. The enzyme performs hydrolysis (cleavage) of the DNA's phosphodiester bonds, an action that breaks the long-chain, sticky polymers into small, water-soluble oligonucleotide fragments.

Modulation of Sputum Viscoelasticity

The primary physiological consequence of this targeted enzymatic action is the significant modulation of sputum rheology. By depolymerizing the eDNA structure, dornase alfa rapidly reduces the viscosity (thickness) and viscoelasticity (stickiness) of the secretions. This fluidification of the secretions enhances the mechanical efficiency of mucociliary clearance mechanisms, allowing for easier mobilization of the material from the airways.

Dosage and Administration Information

How to use Pulmozyme

The use of Pulmozyme (dornase alfa) follows specific instructions focusing on standardized delivery via the inhalation route as a solution for long-term administration. The drug is supplied exclusively as a 2.5 mg/2.5 mL solution in single-use ampules.


Administration Scope

The dosage for most patients, including those aged 3 months and older, is 2.5 mg—the full content of one single-use ampule—inhaled once daily (QD). Some patients, particularly older adults, may be prescribed a twice daily (BID) regimen. The medication must be administered using a recommended jet nebulizer or a vibrating mesh nebulizer to ensure proper delivery of the aerosolized solution.

The solution must be used undiluted and must not be mixed with any other drug or solution in the nebulizer cup, as this combination is not part of the standard administration protocol. For pediatric patients who cannot inhale or exhale consistently through a mouthpiece, a suitable face mask accessory, such as the PARI BABY™ system, is required for proper delivery. If a dose is missed, the standard procedure is to take the next scheduled dose at the usual time and not double the dose to compensate.


Resulting Procedural Structure

The correct administration protocol involves a few specific steps: The ampule should be checked to confirm the solution is clear and colorless or slightly yellowish. The entire contents of the single-use ampule are then poured into the nebulizer cup and inhaled until the cup is empty or stops producing mist. This structural framework ensures the consistent, long-term daily use of the drug, where adherence to the specific inhalation device, the unmixed nature of the solution, and the standard single-ampule dose are critical for maintaining the intended use protocol.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Pulmozyme (Dornase Alfa)


Evidence for Use in Cystic Fibrosis (CF) Pulmonary Disease

The core research for Pulmozyme was studied for use in patients with Cystic Fibrosis. The primary evidence comes from Randomized Controlled Trials (RCTs). These are structured studies where patients were randomly assigned to receive one treatment or another (such as a placebo) over a defined period.

Researchers monitored physiological strain and functional limitations by measuring Forced Expiratory Volume in 1 second ( FEV1). Studies also tracked outcomes describing episodic or acute changes, specifically hospitalizations for respiratory infections (pulmonary exacerbations). Studies monitored FEV1 and described patterns where the measured values in the study group were reported as differing from those in the placebo group over follow-up periods. Research explored outcomes related to episodic or acute changes and described patterns where fewer hospitalizations for respiratory issues requiring antibiotics were recorded in some study groups.


Long-Term Data and Follow-Up Periods

While the original RCTs provided necessary short- and intermediate-term evidence, other research, such as observational and registry-based studies, has studied for the longer-term evidence of Pulmozyme. Researchers used this data to track long-term outcomes, such as the annual rate of decline in lung function. The long-term data reported trends in how lung function evolves over many years in the observed populations. However, the evidence for long-term outcomes, especially regarding decades-long use, is limited.


What the Research Still Needs to Clarify

Research highlights what is known — and what is still uncertain. One major area is long-term survival. Because the pivotal RCTs were short-term, the evidence that this medication influences the overall survival or mortality rate over a patient's lifetime is not fully established. Additionally, comparative evidence is lacking; there is limited information from large-scale, head-to-head trials directly comparing the outcomes of Pulmozyme against other inhaled treatments. Subgroup findings are uncertain, as research indicates that the degree of change observed varied widely between individuals.

Frequently Asked Questions (FAQ)

Common questions about Pulmozyme (FAQ)


Q: What happens if I stop using Pulmozyme suddenly?

A: Official information indicates that Pulmozyme is a long-term maintenance treatment, and its beneficial effects are often lost when administration is discontinued. Because the drug works daily to thin mucus, stopping the medication without medical guidance is associated with a potential decline in pulmonary function related to cystic fibrosis.


Q: Do researchers know how long the effects of a Pulmozyme treatment last in the lungs?

A: Regulatory information indicates that the drug’s action is primarily local within the airways. Dornase alfa is poorly absorbed into the bloodstream, and therefore does not provide a lasting systemic effect, requiring consistent daily administration.


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

A: The official product information states that Pulmozyme has no or negligible influence on a person's ability to drive or operate heavy machinery. It is not expected to impair focus or coordination.


Q: Is Pulmozyme a cure for cystic fibrosis?

A: Pulmozyme is officially indicated for the management of cystic fibrosis (CF) and to improve pulmonary function in conjunction with other standard therapies. It is a maintenance medication designed to address the symptoms of thick mucus; it is not described as a cure for the underlying disease.


Q: Can using Pulmozyme lead to an infection?

A: Official data indicates that the drug is intended for use during acute respiratory infections in conjunction with other standard therapies. While the drug has been studied to help reduce the risk of respiratory infections requiring antibiotics in certain patients, regulatory documents do not list infections as a common adverse reaction caused by the drug itself.


Q: Are headaches a frequent side effect mentioned in the studies for Pulmozyme?

A: Based on clinical trial data, headache has been reported in less than 1% of patients. It is therefore not among the most commonly documented adverse reactions (incidence of ge 3% more than placebo).


Q: What should be done if Pulmozyme causes irritation in the mouth or throat?

A: Sore throat, voice changes (hoarseness), and throat discomfort are listed in official safety documents as possible side effects. If these or any other adverse effects are experienced, official guidance recommends reporting them to a healthcare provider for appropriate assessment.


Q: Does Pulmozyme clear up mucus right away, or does it take time?

A: The mechanism of action involves a rapid reduction in the viscosity (thickness) of lung secretions by breaking down DNA in the mucus. Some clinical changes have been observed within days, but the full extent of the physiological changes may take longer to be reflected in patient-reported outcomes.


Q: Are there specific food or drink interactions to be concerned about when using Pulmozyme?

A: Official labeling focuses on drug-drug interactions. Because Pulmozyme works locally in the lungs and has minimal systemic exposure, there are no documented clinically important drug-food interactions that affect how the medicine works in the body.


Q: Does Pulmozyme interact with common over-the-counter pain relievers?

A: The official product information confirms that Pulmozyme has been routinely administered alongside standard CF therapies, including oral and parenteral analgesics (pain relievers), without documented systemic interaction concerns.


Q: What is the difference between Pulmozyme and other inhaled CF medications?

A: Pulmozyme is a specialized mucolytic enzyme (dornase alfa) that works by chemically cutting the DNA strands found in thick mucus, with the goal of facilitating the clearance of secretions. It is typically co-administered with other inhaled medications like bronchodilators and inhaled antibiotics, but must never be mixed with other drugs in the nebulizer cup.


Q: Why is Pulmozyme specifically for certain patients with cystic fibrosis?

A: The drug is indicated for CF patients who have a confirmed diagnosis. While the medication can be used in most eligible patients, clinical trials have documented a specific benefit, such as a reduced risk of respiratory infection, for those with a forced vital capacity ( FVC) greater than or equal to 40% of the predicted value.


Q: Does Pulmozyme interact with common cold or flu medications?

A: Due to its localized action in the lungs, Pulmozyme has minimal systemic exposure and no documented clinically important drug-drug interactions. It is routinely used alongside other common medications, but for any specific over-the-counter cold or flu product, consultation with a healthcare provider is recommended.


Q: Can using Pulmozyme make coughing worse before it gets better?

A: The active ingredient works by making mucus thinner and easier to clear, which may result in a change in the quantity or characteristics of sputum. While cough is reported as an adverse reaction, the official labeling does not specifically state that symptoms will worsen before they improve.


Q: What is the long-term safety profile described in the research for Pulmozyme?

A: The long-term evidence primarily involves observational studies that have tracked how lung function evolves over many years in patients using Pulmozyme. The medication is used as a chronic therapy, and overall safety and tolerability are consistent with the short-term trials.


Q: Does Pulmozyme contain steroids or antibiotics?

A: Pulmozyme is officially classified as a recombinant enzyme and a mucolytic agent. It is a protein-based therapy and is administered alongside—but is distinct from—other inhaled medications such as steroids and antibiotics, which are often used in CF management.


Q: How quickly do patients typically notice changes after starting Pulmozyme?

A: While the drug's effect on mucus thickness begins quickly, the patient's perception of change can vary. Clinical studies observed rapid changes in lung function within days of starting treatment, but the full extent of the physiological changes may take longer to be reflected in patient-reported outcomes.


Q: Is there any research on the use of Pulmozyme in older adults?

A: The administration section notes that some patients, particularly older adults, may be prescribed a twice-daily dosing regimen. However, specialized studies on the medication's effect in older adults are not detailed in the core randomized clinical trial data.


Q: Why do some people need to use Pulmozyme every day?

A: Pulmozyme is intended for long-term daily use to continuously manage the thick, sticky mucus characteristic of cystic fibrosis. Because the drug's activity is local and does not last indefinitely in the airways, daily administration is required to consistently break down the mucus structure.


Q: Does Pulmozyme have any potential drug interactions with birth control pills?

A: Regulatory documents state there are no documented clinically important systemic drug-drug interactions because the medicine has minimal absorption into the bloodstream. This means it is generally not expected to interfere with the body's processing of oral contraceptives or other systemic medications.


Q: What types of patient groups were excluded from the Pulmozyme clinical trials?

A: The initial pivotal trials focused on patients with confirmed cystic fibrosis, mostly aged five years and older. Patients who did not meet the eligibility criteria at the time of the studies, or those with very low lung function (e.g., FVC < 40%), may have been excluded from the core efficacy trials.


Q: What are the general expectations for a patient starting Pulmozyme therapy?

A: Clinical trials tracked significant outcomes, including improvement in lung function and a reduced risk of respiratory infections requiring intravenous antibiotics. Patients beginning therapy should note that the daily use of the medicine is intended to contribute to the long-term management of their CF.


Q: What do official documents say about using Pulmozyme if I have a severe lung infection?

A: Pulmozyme is indicated for daily use in conjunction with standard therapies for CF management. Official information confirms the drug is intended to be used safely alongside standard treatments for respiratory infections.


Q: What are the potential drug interactions with common high blood pressure medications?

A: Official labeling emphasizes that Pulmozyme has no documented systemic drug-drug interactions because its action is local in the lungs and there is minimal absorption into the body. Therefore, the drug is not expected to interfere with common oral high blood pressure medications.


Q: Is there a maximum time someone can stay on Pulmozyme treatment?

A: Pulmozyme is classified as a long-term maintenance treatment. While the core randomized trials were limited to shorter timeframes, the medication is routinely used for extended periods, though long-term evidence for decades-long use is still accumulating through observational research.


Q: How is the safety of Pulmozyme described for use in adolescents?

A: The safety and effectiveness of Pulmozyme have been established in pediatric patients, including the adolescent age group (5 to 17 years). The nature and incidence of adverse reactions in adolescents are generally similar to those seen in the larger placebo-controlled trials.

How should Pulmozyme be stored and disposed of?

Storage and Disposal Requirements

Pulmozyme (dornase alfa) must be stored under specific conditions to preserve the stability of the solution. The medicine requires refrigeration at a temperature between 2 C to 8 C (36 F to 46 F) and must not be frozen.

Storage Constraint Requirement
Temperature Range 2 C to 8 C (Do not freeze)
Protection Keep in original foil pouch, protected from light
Stability Limit Total time outside of refrigeration (up to 30 C) must not exceed 24 hours
Child Safety Keep out of the reach of children

Each ampule is for single use. Any remaining contents in an opened ampule must be immediately discarded. The solution should be discarded if it appears cloudy or discolored. Disposal of unused or expired product must be carried out in accordance with local pharmaceutical waste regulations.

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

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