Pirbuterol

Pirbuterol
	Adult Indications & Dosage
	Pediatric Indications & Dosage
	Contraindications
	Warnings & Precautions
	Adverse Reactions
	Drug Interactions
	Use in Specific Populations
	Administration & Monitoring
	Overdosage
	Pharmacology
	Clinical Studies
	How Supplied
	Images
	Patient Counseling Information
	Precautions with Alcohol
	Brand Names
	Look-Alike Names

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Rabin Bista, M.B.B.S. [2]

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Overview

Pirbuterol is a Beta-2 Adrenergic Agonist that is FDA approved for the treatment of of bronchospasm in patients 12 years of age and older with reversible bronchospasm including asthma.. Common adverse reactions include nervousness, tremor.

Adult Indications and Dosage

FDA-Labeled Indications and Dosage (Adult)

Indications

MAXAIR Inhaler is indicated for the prevention and reversal of bronchospasm in patients 12 years of age and older with reversible bronchospasm including asthma. It may be used with or without concurrent theophylline and/or corticosteroid therapy.

Dosage

The usual dose for adults and children 12 years and older is two inhalations (400 mcg) repeated every 4-6 hours. One inhalation (200 mcg) repeated every 4-6 hours may be sufficient for some patients.

A total daily dose of 12 inhalations should not be exceeded. If a previously effective dosage regimen fails to provide the usual relief, medical advice should be sought immediately as this is often a sign of seriously worsening asthma which would require reassessment of therapy.

As with all aerosol medications, it is recommended to prime (test) MAXAIR Inhaler before using for the first time and in cases where the inhaler has not been used for more than 2 weeks. Prime by releasing three “test sprays” into the air away from yourself and other people.

Off-Label Use and Dosage (Adult)

Guideline-Supported Use

There is limited information regarding Off-Label Guideline-Supported Use of Pirbuterol in adult patients.

Non–Guideline-Supported Use

There is limited information regarding Off-Label Non–Guideline-Supported Use of Pirbuterol in adult patients.

Pediatric Indications and Dosage

FDA-Labeled Indications and Dosage (Pediatric)

Dosage

The usual dose for adults and children 12 years and older is two inhalations (400 mcg) repeated every 4-6 hours. One inhalation (200 mcg) repeated every 4-6 hours may be sufficient for some patients.

Off-Label Use and Dosage (Pediatric)

Guideline-Supported Use

There is limited information regarding Off-Label Guideline-Supported Use of Pirbuterol in pediatric patients.

Non–Guideline-Supported Use

There is limited information regarding Off-Label Non–Guideline-Supported Use of Pirbuterol in pediatric patients.

Contraindications

MAXAIR Inhaler is contraindicated in patients with a history of hypersensitivity to pirbuterol or any of its ingredients.

Warnings

Cardiovascular

MAXAIR Inhaler, like other inhaled beta-adrenergic agonists, can produce a clinically significant cardiovascular effect in some patients, as measured by pulse rate, blood pressure, and/or symptoms. Although such effects are uncommon after administration of MAXAIR Inhaler at recommended doses, if they occur, the drug may need to be discontinued. In addition, beta-agonists have been reported to produce ECG changes, such as flattening of the T wave, prolongation of the QTc interval, and ST segment depression. The clinical significance of these findings is unknown. Therefore, MAXAIR Inhaler, like all sympathomimetic amines, should be used with caution in patients with cardiovascular disorders, especially coronary insufficiency, cardiac arrhythmias, and hypertension.

Paradoxical Bronchospasm

MAXAIR Inhaler can produce paradoxical bronchospasm, which can be life threatening. If paradoxical bronchospasm occurs, MAXAIR Inhaler should be discontinued immediately and alternative therapy instituted. It should be recognized that paradoxical bronchospasm, when associated with inhaled formulations, frequently occurs with the first use of a new canister or vial.

Use of Anti-Inflammatory Agents

The use of beta adrenergic agonist bronchodilators alone may not be adequate to control asthma in many patients. Early consideration should be given to adding anti-inflammatory agents, e.g., corticosteroids.

Deterioration of Asthma

Asthma may deteriorate acutely over a period of hours or chronically over several days or longer. If the patient needs more doses of MAXAIR Inhaler than usual, this may be a marker of destabilization of asthma and requires reevaluation of the patient and the treatment regimen, giving special consideration to the possible need for anti-inflammatory treatment, e.g., corticosteroids.

Precautions

General

Since pirbuterol is a sympathomimetic amine, it should be used with caution in patients with cardiovascular disorders, including ischemic heart disease, hypertension, or cardiac arrhythmias, in patients with hyperthyroidism or diabetes mellitus, and in patients who are unusually responsive to sympathomimetic amines or who have convulsive disorders. Significant changes in systolic and diastolic blood pressure could be expected to occur in some patients after use of any beta adrenergic aerosol bronchodilator.

Beta adrenergic agonist medications may produce significant hypokalemia in some patients, possibly through intracellular shunting, which has the potential to produce adverse cardiovascular effects. The decrease is usually transient, not requiring supplementation.

Adverse Reactions

Clinical Trials Experience

The following rates of adverse reactions to pirbuterol are based on single- and multiple-dose clinical trials involving 761 patients, 400 of whom received multiple doses (mean duration of treatment was 2.5 months and maximum was 19 months).

The following were the adverse reactions reported more frequently than 1 in 100 patients:

CNS

nervousness (6.9%), tremor (6.0%), headache (2.0%), dizziness (1.2%).

Cardiovascular

palpitations (1.7%), tachycardia (1.2%).

Respiratory

cough (1.2%).

Gastrointestinal

nausea (1.7%).

The following adverse reactions occurred less frequently than 1 in 100 patients and there may be a causal relationship with pirbuterol:

Ear, Nose and Throat

smell/taste changes, sore throat.

Dermatological

rash, pruritus.

Other

numbness in extremities, alopecia, bruising, fatigue, edema, weight gain, flushing.

Other adverse reactions were reported with a frequency of less than 1 in 100 patients but a causal relationship between pirbuterol and the reaction could not be determined: migraine, productive cough, wheezing, and dermatitis.

The following rates of adverse reactions during three-month controlled clinical trials involving 310 patients are noted. The table does not include mild reactions.

Electrocardiograms

Electrocardiograms, obtained during a randomized, double-blind, cross-over study in 57 patients, showed no observations or findings considered clinically significant, or related to drug administration. Most electrocardiographic observations, obtained during a randomized, double blind, cross-over study in 40 patients, were judged not clinically significant or related to drug administration. One patient was noted to have some changes on the one hour postdose electrocardiogram consisting of ST and T wave abnormality suggesting possible inferior ischemia. This abnormality was not observed on the predose or the six hours postdose ECG. A treadmill was subsequently performed and all the findings were normal.

Postmarketing Experience

There is limited information regarding Postmarketing Experience of Pirbuterol in the drug label.

Drug Interactions

Other short-acting beta adrenergic aerosol bronchodilators should not be used concomitantly with MAXAIR Inhaler because they may have additive effects.

Monoamine Oxidase Inhibitors or Tricyclic Antidepressants

Pirbuterol should be administered with extreme caution to patients being treated with monoamine oxidase inhibitors or tricyclic antidepressants, or within 2 weeks of discontinuation of such agents, because the action of pirbuterol on the vascular system may be potentiated.

Beta Blockers

Beta adrenergic receptor blocking agents not only block the pulmonary effect of beta-agonists, such as MAXAIR Inhaler, but may produce severe bronchospasm in asthmatic patients. Therefore, patients with asthma should not normally be treated with beta blockers. However, under certain circumstances, e.g., as prophylaxis after myocardial infarction, there may be no acceptable alternatives to the use of beta adrenergic blocking agents in patients with asthma. In this setting, cardioselective beta blockers could be considered, although they should be administered with caution.

Diuretics

The ECG changes and/or hypokalemia that may result from the administration of non-potassium sparing diuretics (such as loop or thiazide diuretics) can be acutely worsened by beta-agonists, especially when the recommended dose of the beta-agonist is exceeded. Although the clinical significance of these effects is not known, caution is advised in the coadministration of beta-agonists with non-potassium sparing diuretics.

Use in Specific Populations

Pregnancy

Pregnancy Category (FDA): C

Pirbuterol was not teratogenic in rats administered oral doses of 30, 100, and 300 mg/kg (approximately 100, 340, and 1000 times the maximum recommended daily inhalation dose for adults on a mg/m2 basis). Pirbuterol was not teratogenic in rabbits administered oral doses of 30 and 100 mg/kg (approximately 200 and 680 times the maximum recommended inhalation dose for adults on a mg/m2 basis). However, pirbuterol at an oral dose of 300 mg/kg (approximately 2000 times the maximum recommended daily inhalation dose for adults on a mg/m2 basis) caused abortions and fetal death.

There are no adequate and well-controlled studies in pregnant women. Pirbuterol should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

Pregnancy Category (AUS):

Australian Drug Evaluation Committee (ADEC) Pregnancy Category

There is no Australian Drug Evaluation Committee (ADEC) guidance on usage of Pirbuterol in women who are pregnant.

Labor and Delivery

Because of the potential for beta-agonist interference with uterine contractility, use of MAXAIR Inhaler for relief of bronchospasm during labor should be restricted to those patients in whom the benefits clearly outweigh the risk.

Nursing Mothers

It is not known whether pirbuterol is excreted in human milk. Therefore, MAXAIR Inhaler should be used during nursing only if the potential benefit justifies the possible risk to the newborn.

Pediatric Use

MAXAIR Inhaler is not recommended for patients under the age of 12 years because of insufficient clinical data to establish safety and effectiveness.

Geriatic Use

There is no FDA guidance on the use of Pirbuterol with respect to geriatric patients.

Gender

There is no FDA guidance on the use of Pirbuterol with respect to specific gender populations.

Race

There is no FDA guidance on the use of Pirbuterol with respect to specific racial populations.

Renal Impairment

There is no FDA guidance on the use of Pirbuterol in patients with renal impairment.

Hepatic Impairment

There is no FDA guidance on the use of Pirbuterol in patients with hepatic impairment.

Females of Reproductive Potential and Males

There is no FDA guidance on the use of Pirbuterol in women of reproductive potentials and males.

Immunocompromised Patients

There is no FDA guidance one the use of Pirbuterol in patients who are immunocompromised.

Administration and Monitoring

Administration

Inhalation

Monitoring

There is limited information regarding Monitoring of Pirbuterol in the drug label.

IV Compatibility

There is limited information regarding IV Compatibility of Pirbuterol in the drug label.

Overdosage

The expected symptoms with overdosage are those of excessive beta-stimulation and/or any of the symptoms listed under ADVERSE REACTIONS, e.g., seizures, angina, hypertension or hypotension, tachycardia with rates up to 200 beats per minute, arrhythmias, nervousness, headache, tremor, dry mouth, palpitation, nausea, dizziness, fatigue, malaise, and insomnia. Hypokalemia may also occur. As with all sympathomimetic aerosol medication, cardiac arrest and even death may be associated with abuse of MAXAIR Inhaler.

Treatment consists of discontinuation of pirbuterol together with appropriate symptomatic therapy. The judicious use of a cardioselective beta-receptor blocker may be considered, bearing in mind that such medication can produce bronchospasm. There is insufficient evidence to determine if dialysis is beneficial for overdosage.

The oral median lethal dose of pirbuterol dihydrochloride in mice and rats is greater than 2000 mg/kg (approximately 3400 and 6800 times the maximum recommended daily inhalation dose for adults on a mg/m2 basis).

Pharmacology



1 : 1 mixture (racemate)Pirbuterol
Systematic (IUPAC) name
(RS)-6-[2-(tert-butylamino)-1-hydroxyethyl]-2-(hydroxymethyl)pyridin-3-ol
Identifiers
CAS number	38029-10-6
ATC code	R03AC08 R03CC07 (WHO)
PubChem	4845
DrugBank	DB01291
Chemical data
Formula	Template:OrganicBox atom Template:OrganicBox atom Template:OrganicBox Template:OrganicBox Template:OrganicBox Template:OrganicBox Template:OrganicBox Template:OrganicBox Template:OrganicBox Template:OrganicBox Template:OrganicBox Template:OrganicBox Template:OrganicBox Template:OrganicBox atom Template:OrganicBox Template:OrganicBox atom Template:OrganicBox Template:OrganicBox Template:OrganicBox Template:OrganicBox Template:OrganicBox Template:OrganicBox Template:OrganicBox
Mol. mass	240.30 g/mol 300.3 g/mol (acetate)
SMILES	eMolecules & PubChem
Pharmacokinetic data
Bioavailability	?
Metabolism	?
Half life	?
Excretion	?
Therapeutic considerations
Pregnancy cat.	C
Legal status	[[Prescription drug\|Template:Unicode-only]](US)
Routes	Inhalational

Mechanism of Action

The pharmacologic effects of beta adrenergic agonist drugs, including pirbuterol, are at least in part attributable to stimulation through beta adrenergic receptors of intracellular adenyl cyclase, the enzyme which catalyzes the conversion of adenosine triphosphate (ATP) to cyclic-3′,5′-adenosine monophosphate (c-AMP). Increased c-AMP levels are associated with relaxation of bronchial smooth muscle and inhibition of release of mediators of immediate hypersensitivity from cells, especially from mast cells.

In vitro studies and in vivo pharmacologic studies have demonstrated that pirbuterol has a preferential effect on beta-2 adrenergic receptors compared with isoproterenol. While it is recognized that beta-2 adrenergic receptors are the predominant receptors in bronchial smooth muscle, data indicate that there is a population of beta-2 receptors in the human heart, existing in a concentration between 10-50%. The precise function of these receptors has not been established

Bronchodilator activity of pirbuterol was manifested clinically by an improvement in various pulmonary function parameters (FEV1, MMF, PEFR, airway resistance [RAW] and conductance [GA/Vtg]).

Structure

The active component of MAXAIR Inhaler (pirbuterol acetate) is (R,S)a6-{ [(1,1-dimethylethyl)amino]methyl}-3-hydroxy-2,6-pyridine-dimethanol monoacetate salt, a beta-2 adrenergic bronchodilator, having the following chemical structure:

This image is provided by the National Library of Medicine.

Pirbuterol acetate is a white, crystalline racemic mixture of two optically active isomers. It is a powder, freely soluble in water, with a molecular weight of 300.3 and empirical formula of C12H20N2O3•C2H4O2.

MAXAIR Inhaler is a pressurized metered-dose aerosol unit for oral inhalation. It provides a fine-particle suspension of pirbuterol acetate in the propellant mixture of trichloromonofluoromethane and dichlorodifluoromethane, with sorbitan trioleate. Each actuation delivers 256 mcg of pirbuterol (as pirbuterol acetate) from the valve and 200 mcg of pirbuterol (as pirbuterol acetate) from the mouthpiece. Each canister provides 300 inhalations.

As with all aerosol medications, it is recommended to prime (test) MAXAIR Inhaler before using for the first time and in cases where the inhaler has not been used for more than 2 weeks. Prime by releasing three “test sprays” into the air away from yourself and other people.

Pharmacodynamics

There is limited information regarding Pharmacodynamics of Pirbuterol in the drug label.

Pharmacokinetics

As expected by extrapolation from oral data, systemic blood levels of pirbuterol are below the limit of assay sensitivity (2-5 ng/ml) following inhalation of doses up to 800 mcg (twice the maximum recommended dose). A mean of 51% of the dose is recovered in urine as pirbuterol plus its sulfate conjugate following administration by aerosol. Pirbuterol is not metabolized by catechol-O-methyltransferase. The percent of administered dose recovered as pirbuterol plus its sulfate conjugate does not change significantly over the dose range of 400 mcg to 800 mcg and is not significantly different from that after oral administration of pirbuterol. The plasma half-life measured after oral administration is about two hours.

Nonclinical Toxicology

Carcinogenicity, Mutagenesis and Impairment of Fertility

In a 2-year study in Sprague-Dawley rats, pirbuterol hydrochloride administered at dietary doses of 1.0, 3.0, and 10 mg/kg (approximately 3, 10, and 35 times the maximum recommended daily inhalation dose for adults and children on a mg/m2 basis) showed no evidence of carcinogenicity. In an 18-month study in mice at dietary doses of 1.0, 3.0, and 10 mg/kg (approximately 2, 5, and 15 times the maximum recommended daily inhalation dose for adults and children on a mg/m2 basis) no evidence of tumorigenicity was seen. Reproduction studies in rats administered pirbuterol hydrochloride at oral doses of 1, 3, and 10 mg/kg (approximately 3, 10, and 35 times the maximum recommended daily inhalation dose for adults on a mg/m2 basis) revealed no evidence of impaired fertility.

Pirbuterol dihydrochloride showed no evidence of mutagenicity in in vitro assays and host-mediated microbial (Ames) assays for point mutations and in vivo tests for somatic or germ cell effects following acute and subchronic treatment in mice (cytogenicity assays).

Clinical Studies

Clinical Trials

In controlled, double-blind, single-dose clinical trials, the onset of improvement in pulmonary function occurred within 5 minutes in most patients as determined by forced expiratory volume in one second (FEV1). FEV1 and MMF measurements also showed that maximum improvement in pulmonary function generally occurred 30-60 minutes following one (1) or two (2) inhalations of pirbuterol (200-400 mcg). The duration of action of pirbuterol is maintained for 5 hours (the time at which the last observations were made) in a substantial number of patients, based on a 15% or greater increase in FEV1. In controlled repetitive-dose studies of 12 weeks' duration, 74% of 156 patients on pirbuterol and 62% of 141 patients on metaproterenol showed a clinically significant improvement based on a 15% or greater increase in FEV1 on at least half of the days. Onset and duration were equivalent to that seen in single-dose studies. Continued effectiveness was demonstrated over the 12-week period in the majority (94%) of responding patients; however, chronic dosing was associated with the development of tachyphylaxis (tolerance) to the bronchodilator effect in some patients in both treatment groups.

A placebo-controlled, double-blind, single-dose study (24 patients per treatment group), utilizing continuous Holter monitoring for 5 hours after drug administration, showed no significant difference in ectopic activity between the placebo control group and pirbuterol at the recommended dose (200-400 mcg), and twice the recommended dose (800 mcg). As with other inhaled beta adrenergic agonists, supraventricular and ventricular ectopic beats have been seen with pirbuterol (see WARNINGS).

Preclinical

Studies in laboratory animals (minipigs, rodents, and dogs) have demonstrated the occurrence of cardiac arrhythmias and sudden death (with histologic evidence of myocardial necrosis) when beta-agonists and methylxanthines were administered concurrently. The clinical significance of these findings when applied to humans is unknown.

How Supplied

MAXAIR Inhaler, box of one, is supplied in a pressurized aluminum canister with a light blue plastic actuator and attached white mouthpiece. Each actuation delivers pirbuterol acetate equivalent to 256 mcg of pirbuterol (as pirbuterol acetate) from the valve and 200 mcg of pirbuterol (as pirbuterol acetate) from the mouthpiece.

Net content weight 25.6 g, 300 metered inhalations (NDC 0089-0790-21).

The correct amount of medication in each canister cannot be assured after 300 actuations even though the canister is not completely empty. The canister should be discarded when the labeled number of actuations has been used.

Note: The indented statement below is required by the Federal government's Clean Air Act for all products containing or manufactured with chlorofluorocarbons (CFC's).

WARNING: Contains trichloromonofluoromethane and dichlorodifluoromethane, substances which harm public health and environment by destroying ozone in the upper atmosphere.
A notice similar to the above WARNING has been placed in the “PATIENT'S INSTRUCTIONS FOR USE” portion of this package insert under the Environmental Protection * Agency's (EPA's) regulations. The patient's warning states that the patient should consult his or her physician if there are questions about alternatives.

Rx only

Storage

Store between 15° and 30°C (59° to 86°F). Failure to use this product within this temperature range may result in improper dosing. For optimal results, the canister should be at room temperature before use. Shake well before using.

The contents of MAXAIR Inhaler are under pressure. Do not puncture. Do not use or store near heat or open flame. Exposure to temperature above 120°F may cause bursting. Never throw container into fire or incinerator. Keep out of reach of children. Avoid spraying in eyes.

The light blue plastic actuator supplied with MAXAIR Inhaler should not be used with any other product canisters, and actuators from other products should not be used with MAXAIR Inhaler canister.

Images

Drug Images

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Package and Label Display Panel

Ingredients and Appearance

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Patient Counseling Information

Information for Patients: The action of MAXAIR Inhaler should last up to five hours or longer. MAXAIR Inhaler should not be used more frequently than recommended. Do not increase the dose or frequency of MAXAIR Inhaler without consulting your physician. If you find that treatment with MAXAIR Inhaler becomes less effective for symptomatic relief, or your symptoms become worse, and/or you need to use the product more frequently than usual, you should seek medical attention immediately. While you are using MAXAIR Inhaler, other inhaled drugs and asthma medications should be taken only as directed by your physician. Common adverse effects include palpitations, chest pain, rapid heart rate, tremor or nervousness. If you are pregnant or nursing, contact your physician about use of MAXAIR Inhaler. Effective and safe use includes an understanding of the way the medication should be administered. As with all aerosol medications, it is recommended to prime (test) MAXAIR Inhaler before using for the first time and in cases where the inhaler has not been used for more than 2 weeks. Prime by releasing three “test sprays” into the air away from yourself and other people.

SUPPLEMENTAL PATIENT MATERIAL

MAXAIR™ Inhaler

pirbuterol acetate inhalation aerosol

PATIENT'S INSTRUCTIONS FOR USE

Before using your MAXAIR Inhaler, read the following instructions carefully.

NOTE: Your MAXAIR Inhaler is assembled with a special one-piece light blue plastic actuator and attached white mouthpiece/cap that protects your Inhaler from dust during shipping and in between use (see FIGURE A).

Cleanse the Inhaler thoroughly at least once a day. Remove the canister and rinse the mouthpiece/cap section with warm running water. If soap is used, rinse thoroughly with plain water. Allow the actuator to dry before reuse (do not expose to excessive heat; see CAUTION below), then reassemble.

Dosage: Use only as directed by your physician. The correct amount of medication in each canister cannot be assured after 300 actuations even though the canister is not completely empty. You should keep track of the number of actuations used from each MAXAIR Inhaler and discard the canister after 300 actuations. The canister should be discarded when the labeled number of actuations has been used. Before you reach the specified number of actuations, you should consult your physician to determine whether a refill is needed. Just as you should not take extra doses without consulting your physician, you should not stop using MAXAIR Inhaler without consulting your physician.

WARNINGS: The effects of MAXAIR Inhaler may last up to five hours or longer. Therefore, it should not be used more frequently than recommended. Do not increase the number or frequency of doses without speaking with the prescribing physician. If the recommended dosage does not provide relief of symptoms, or your symptoms get worse, speak with your physician. While taking MAXAIR Inhaler, other inhaled medicines should not be used unless prescribed.

Note: The indented statement below is required by the Federal government's Clean Air Act for all products containing or manufactured with chlorofluorocarbons (CFC's).

This product contains trichloromonofluoromethane and dichlorodifluoromethane, substances which harm the environment by destroying ozone in the upper atmosphere.

Your physician has determined that this product is likely to help your personal health. USE THIS PRODUCT AS DIRECTED, UNLESS INSTRUCTED TO DO OTHERWISE BY YOUR PHYSICIAN. If you have any questions about alternatives, consult with your physician.

Caution: CONTENTS UNDER PRESSURE. Do not puncture. Do not use or store near heat or open flame. Exposure to temperature above 120°F may cause bursting. Never throw canister into fire or incinerator. Avoid spraying in eyes. KEEP OUT OF REACH OF CHILDREN.

Store between 15° and 30°C (59° to 86°F). Failure to use this product within this temperature range may result in improper dosing. For optimal results, the canister should be at room temperature before use. Shake well before using.

Precautions with Alcohol

Alcohol-Pirbuterol interaction has not been established. Talk to your doctor about the effects of taking alcohol with this medication.

Brand Names

Maxair®^[1]

Look-Alike Drug Names

There is limited information regarding Pirbuterol Look-Alike Drug Names in the drug label.

Drug Shortage Status

Price

References

The contents of this FDA label are provided by the National Library of Medicine.

↑ "Pirbuterol Acetate".

[1] "Pirbuterol Acetate".

[1]