metaproterenol sulfate

Oral Beta-2 Agonists
Respiratory Short-Acting Beta-2 Agonists (SABA)

If GI irritation occurs, administer metaproterenol with food or milk.

Oral syrup: Administer metaproterenol using a calibrated measuring device.

Following metaproterenol administration, instruct patient to rinse mouth and gargle to minimize dry mouth or throat, throat irritation, and hoarseness.
 
Aerosol inhalation
Instruct patient on proper inhalation technique (see Patient Information for specific inhaler product).
A tube spacer extension may be beneficial in patients unable to coordinate inhalation and actuation.
To avoid the spread of infection, do not use an inhaler for more than one person.
 
Solution for nebulization
Do not use metaproterenol solutions that contain a precipitate or have a brown, pinkish, or darker than slightly yellow color.
Hand-bulb nebulizer: Administer desired dose using the undiluted 5% inhalation solution.
Intermittent positive pressure breathing (IPPB) apparatus or nebulizer: Dilute each dose of the 5% inhalation solution in 2.5 ml of 0.9% Sodium Chloride (NS). More dilute solutions (e.g., 0.4% of 0.6%) may be used without dilution. Each 0.4% vial (2.5 ml) is equal to 0.2 mL of the 5% solution (10 mg) which is diluted to 2.5 mL with 0.9% Sodium Chloride (NS). Each 0.6% vial (2.5 ml) is equal to 0.3 mL of the 5% solution (15 mg) which is diluted to 2.5 mL with 0.9% Sodium Chloride (NS).

arrhythmia exacerbation / Early / Incidence not known

sinus tachycardia / Rapid / 6.1-17.1
palpitations / Early / 3.8-3.8
hypertension / Early / 0.4-0.4
chest pain (unspecified) / Early / 0.2-0.2
edema / Delayed / 0.2-0.2
myoclonia / Delayed / 0.2-0.2
blurred vision / Early / 0.2-0.2
hypokalemia / Delayed / Incidence not known
premature ventricular contractions (PVCs) / Early / Incidence not known
QT prolongation / Rapid / Incidence not known

tremor / Early / 1.6-16.9
headache / Early / 1.1-7.0
nausea / Early / 1.3-3.6
dizziness / Early / 2.4-2.4
insomnia / Early / 1.8-1.8
fatigue / Early / 1.4-1.4
diarrhea / Early / 1.2-1.2
dysgeusia / Early / 0.8-0.8
vomiting / Early / 0.8-0.8
drowsiness / Early / 0.6-0.6
syncope / Early / 0.4-0.4
xerostomia / Early / 0.4-0.4
pruritus / Rapid / 0.4-0.4
fever / Early / 0.4-0.4
weakness / Early / 0.2-0.2
cough / Delayed / 0.2-0.2
muscle cramps / Delayed / 0.2-0.2
musculoskeletal pain / Early / 0.2-0.2
urticaria / Rapid / 0.2-0.2
diaphoresis / Early / 0.2-0.2
influenza / Delayed / 0.2-0.2
chills / Rapid / 0.2-0.2

Alupent

Rx

Oral and inhalational beta-agonist that exhibits non-selective beta-agonist activity
Used in adults and pediatric patients 6 years and older for asthma; used in adults for COPD; oral beta-agonists are not preferred for either condition
More selective short-acting beta-2 agonists (SABAs) such as albuterol and levalbuterol are preferred over this drug

Usual dose is 1 vial of 0.4% of 0.6% inhalation solution inhaled not more than every 4 hours as needed to relieve acute bronchospasm, using an intermittent positive pressure breathing apparatus (IPPB) or air driven nebulizer.

20 mg PO 3 to 4 times per day. For geriatric adults, initially give 10 mg PO 3 to 4 times per day, increasing up to 20 mg PO 3 to 4 times per day if needed. Both NAEPP and GINA recommend against the use of oral short-acting beta-2 agonists due to the slow onset of action and increased risk for side effects.

20 mg PO given 3 to 4 times per day. Both NAEPP and GINA recommend against the use of oral short-acting beta-2 agonists due to the slow onset of action and increased risk for side effects.

10 mg PO given 3 to 4 times per day. Both NAEPP and GINA recommend against the use of oral short-acting beta-2 agonists due to the slow onset of action and increased risk for side effects.

Clinical experience is limited. Total daily doses of approximately 1.3 to 2.6 mg/kg/day PO, given in divided doses, have been well tolerated. Single doses 0.4 mg/kg/dose PO achieved a maximum bronchodilatory effect similar to that of higher doses (0.6 to 0.8 mg/kg/dose PO) in children more than 2 years of age; doses have ranged as low as 0.2 mg/kg/dose PO. Both NAEPP and GINA recommend against the use of oral short-acting beta-2 agonists due to the slow onset of action and increased risk for side effects.

1 vial of 0.4% or 0.6% inhalation solution inhaled via nebulizer, not more than every 4 hours as needed to relieve acute bronchospasm, using an intermittent positive pressure breathing apparatus (IPPB) or air driven nebulizer. For COPD maintenance, 1 vial of nebulizer solution may be administered 3 or 4 times per day. According to the Global Initiative for Chronic Obstructive Lung Disease (GOLD) guidelines for COPD, more selective short-acting beta agonists, such as albuterol or levalbuterol, are generally preferred vs. metaproterenol. Inhaled SABAs may be used for therapy in patients with mild COPD (Group A) and in combination with other treatments in those with more severe disease (Groups B, C, and D); inhaled SABAs are preferred for the management of COPD exacerbations, with or without an inhaled antimuscarinic agent. Oral beta agonists (e.g., metaproterenol oral formulas) are not preferred for COPD patients.

Specific guidelines for dosage adjustments in hepatic impairment are not available; it appears that no dosage adjustments are needed.

Specific guidelines for dosage adjustments in renal impairment are not available; it appears that no dosage adjustments are needed.

Abarelix: (Major) Since abarelix can cause QT prolongation, abarelix should be used cautiously, if at all, with other drugs that are associated with QT prolongation. Prescribers need to weigh the potential benefits and risks of abarelix use in patients with prolonged QT syndrome or in patients taking other drugs that may prolong the QT interval. Agents associated with a lower, but possible risk for QT prolongation and torsade de pointes (TdP) based on varying levels of documentation include the beta-agonists. Beta-agonists may cause cardiovascular effects, particularly when used in high doses and/or when associated with hypokalemia.
Acebutolol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Acetaminophen; Aspirin, ASA; Caffeine: (Moderate) Caffeine may enhance the cardiac inotropic effects of beta-agonists.
Acetaminophen; Caffeine: (Moderate) Caffeine may enhance the cardiac inotropic effects of beta-agonists.
Acetaminophen; Caffeine; Dihydrocodeine: (Moderate) Caffeine may enhance the cardiac inotropic effects of beta-agonists.
Acetaminophen; Caffeine; Pyrilamine: (Moderate) Caffeine may enhance the cardiac inotropic effects of beta-agonists.
Acetaminophen; Chlorpheniramine; Dextromethorphan; Phenylephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Acetaminophen; Chlorpheniramine; Dextromethorphan; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Acetaminophen; Chlorpheniramine; Phenylephrine : (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Acetaminophen; Dextromethorphan; Guaifenesin; Phenylephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Acetaminophen; Dextromethorphan; Guaifenesin; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Acetaminophen; Dextromethorphan; Phenylephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Acetaminophen; Dextromethorphan; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Acetaminophen; Dichloralphenazone; Isometheptene: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Acetaminophen; Guaifenesin; Phenylephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Acetaminophen; Phenylephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Acetaminophen; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Acrivastine; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Amphetamine; Dextroamphetamine Salts: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Articaine; Epinephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Aspirin, ASA; Butalbital; Caffeine: (Moderate) Caffeine may enhance the cardiac inotropic effects of beta-agonists.
Aspirin, ASA; Caffeine: (Moderate) Caffeine may enhance the cardiac inotropic effects of beta-agonists.
Aspirin, ASA; Caffeine; Orphenadrine: (Moderate) Caffeine may enhance the cardiac inotropic effects of beta-agonists.
Atenolol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Atenolol; Chlorthalidone: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Benzphetamine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Beta-adrenergic blockers: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Betaxolol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Bisoprolol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Bisoprolol; Hydrochlorothiazide, HCTZ: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Brimonidine; Timolol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Brompheniramine; Dextromethorphan; Phenylephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Brompheniramine; Phenylephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Brompheniramine; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Brompheniramine; Pseudoephedrine; Dextromethorphan: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Bumetanide: (Moderate) Use beta-agonists and loop diuretics with caution due to risk for ECG changes and/or hypokalemia. The ECG changes and/or hypokalemia that may result from administration of loop diuretics can be acutely worsened by beta-agonists, especially when the recommended dose of the beta-agonist is exceeded.
Bupivacaine; Epinephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Butalbital; Acetaminophen; Caffeine: (Moderate) Caffeine may enhance the cardiac inotropic effects of beta-agonists.
Butalbital; Acetaminophen; Caffeine; Codeine: (Moderate) Caffeine may enhance the cardiac inotropic effects of beta-agonists.
Butalbital; Aspirin; Caffeine; Codeine: (Moderate) Caffeine may enhance the cardiac inotropic effects of beta-agonists.
Caffeine: (Moderate) Caffeine may enhance the cardiac inotropic effects of beta-agonists.
Caffeine; Sodium Benzoate: (Moderate) Caffeine may enhance the cardiac inotropic effects of beta-agonists.
Carteolol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Carvedilol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Cetirizine; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Chlophedianol; Dexchlorpheniramine; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Chlorpheniramine; Dextromethorphan; Phenylephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Chlorpheniramine; Dextromethorphan; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Chlorpheniramine; Dihydrocodeine; Phenylephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Chlorpheniramine; Ibuprofen; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Chlorpheniramine; Phenylephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Chlorpheniramine; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Cisapride: (Contraindicated) QT prolongation and ventricular arrhythmias, including torsade de pointes (TdP) and death, have been reported with cisapride. Because of the potential for TdP, use of other drugs that might increase the QT interval is contraindicated with cisapride. Beta-agonists may be associated with adverse cardiovascular effects including QT interval prolongation, usually at higher doses and/or when associated with hypokalemia.
Cocaine: (Moderate) Additive effects and increased toxicity might be observed when using cocaine with beta-agonists, which are sympathomimetic agents. The combined use of these agents may have the potential for additive adrenergic stimulation and side effects, such as nervousness, insomnia, palpitations, or adverse cardiovascular effects.
Codeine; Guaifenesin; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Codeine; Phenylephrine; Promethazine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Desloratadine; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Dexbrompheniramine; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Dexchlorpheniramine; Dextromethorphan; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Dextromethorphan; Diphenhydramine; Phenylephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Dextromethorphan; Guaifenesin; Phenylephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Dextromethorphan; Guaifenesin; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Diethylpropion: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Diphenhydramine; Phenylephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Dobutamine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Dopamine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Dorzolamide; Timolol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Ephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Ephedrine; Guaifenesin: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Epinephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Ergotamine; Caffeine: (Moderate) Caffeine may enhance the cardiac inotropic effects of beta-agonists.
Esmolol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Ethacrynic Acid: (Moderate) Use beta-agonists and loop diuretics with caution due to risk for ECG changes and/or hypokalemia. The ECG changes and/or hypokalemia that may result from administration of loop diuretics can be acutely worsened by beta-agonists, especially when the recommended dose of the beta-agonist is exceeded.
Fexofenadine; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Furosemide: (Moderate) Use beta-agonists and loop diuretics with caution due to risk for ECG changes and/or hypokalemia. The ECG changes and/or hypokalemia that may result from administration of loop diuretics can be acutely worsened by beta-agonists, especially when the recommended dose of the beta-agonist is exceeded.
Green Tea: (Moderate) Some, but not all, green tea products contain caffeine. Caffeine should be avoided or used cautiously with metaproterenol. CNS stimulants and sympathomimetics are associated with adverse effects such as nervousness, irritability, insomnia, and cardiac arrhythmias.
Guaifenesin; Phenylephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Guaifenesin; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Hydrocodone; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Ibuprofen; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Isocarboxazid: (Moderate) Use beta-agonists with caution in patients receiving concomitant monoamine oxidase inhibitors (MAOIs) or within 14 days of stopping treatment with MAOIs because the action of beta-agonists on the cardiovascular system may be potentiated.
Isoproterenol: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Labetalol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Levobunolol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Levothyroxine: (Moderate) Monitor blood pressure and heart rate during concomitant beta-agonist and thyroid hormone use. Concurrent use may increase the effects of sympathomimetics or thyroid hormone. Thyroid hormones may increase the risk of coronary insufficiency when sympathomimetic agents are administered to patients with coronary artery disease.
Levothyroxine; Liothyronine (Porcine): (Moderate) Monitor blood pressure and heart rate during concomitant beta-agonist and thyroid hormone use. Concurrent use may increase the effects of sympathomimetics or thyroid hormone. Thyroid hormones may increase the risk of coronary insufficiency when sympathomimetic agents are administered to patients with coronary artery disease.
Levothyroxine; Liothyronine (Synthetic): (Moderate) Monitor blood pressure and heart rate during concomitant beta-agonist and thyroid hormone use. Concurrent use may increase the effects of sympathomimetics or thyroid hormone. Thyroid hormones may increase the risk of coronary insufficiency when sympathomimetic agents are administered to patients with coronary artery disease.
Lidocaine; Epinephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Linezolid: (Moderate) Linezolid may enhance the hypertensive effect of beta-agonists. Closely monitor for increased blood pressure during coadministration. Linezolid is an antibiotic that is also a weak, reversible nonselective inhibitor of monoamine oxidase (MAO). Therefore, linezolid has the potential for interaction with adrenergic agents, such as the beta-agonists.
Liothyronine: (Moderate) Monitor blood pressure and heart rate during concomitant beta-agonist and thyroid hormone use. Concurrent use may increase the effects of sympathomimetics or thyroid hormone. Thyroid hormones may increase the risk of coronary insufficiency when sympathomimetic agents are administered to patients with coronary artery disease.
Loop diuretics: (Moderate) Use beta-agonists and loop diuretics with caution due to risk for ECG changes and/or hypokalemia. The ECG changes and/or hypokalemia that may result from administration of loop diuretics can be acutely worsened by beta-agonists, especially when the recommended dose of the beta-agonist is exceeded.
Loratadine; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Methacholine: (Major) Discontinue use of short-acting beta-agonists 6 hours before a methacholine challenge test. Beta-agonists inhibit the airway response to methacholine.
Methamphetamine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Metoprolol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Metoprolol; Hydrochlorothiazide, HCTZ: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Midodrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Mobocertinib: (Minor) QT/QTc prolongation can occur with concomitant use of mobocertinib and short-acting beta-agonists although the risk of developing torsade de pointes (TdP) is low. Additional steps to minimize the risk of QT/QTc interval prolongation and TdP, such as avoidance, electrolyte monitoring and repletion, and ECG monitoring, may be considered in patients with additional risk factors for TdP. The risk for QT/QTc prolongation may be greater with long-acting beta-agonists than short-acting beta-agonists.
Monoamine oxidase inhibitors: (Moderate) Use beta-agonists with caution in patients receiving concomitant monoamine oxidase inhibitors (MAOIs) or within 14 days of stopping treatment with MAOIs because the action of beta-agonists on the cardiovascular system may be potentiated.
Nadolol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Naproxen; Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Nebivolol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Nebivolol; Valsartan: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Norepinephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Phendimetrazine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Phenelzine: (Moderate) Use beta-agonists with caution in patients receiving concomitant monoamine oxidase inhibitors (MAOIs) or within 14 days of stopping treatment with MAOIs because the action of beta-agonists on the cardiovascular system may be potentiated.
Phentermine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Phentermine; Topiramate: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Phenylephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Pindolol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Prilocaine; Epinephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Procarbazine: (Major) Procarbazine has MAOI activity and the cardiovascular effects of beta-2 agonists may be potentiated by concomitant use of MAOIs. Although no data are available, procarbazine may interact similarly. Close observation for such effects is prudent, particularly if beta-agonists are administered within two weeks of stopping the MAOI.
Promethazine; Phenylephrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Propranolol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Propranolol; Hydrochlorothiazide, HCTZ: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Pseudoephedrine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Pseudoephedrine; Triprolidine: (Major) Caution and close observation should also be used when metaproterenol is used concurrently with other adrenergic sympathomimetics, administered by any route, to avoid potential for increased cardiovascular effects.
Racepinephrine: (Major) Racepinephrine is a sympathomimetic drug with agonist actions at both the alpha and beta receptors. Patients using prescription beta-agonists for the treatment of asthma should generally avoid the concurrent use of racepinephrine inhalation since additive cardiovascular and nervous system adverse effects are possible, some which may be undesirable.
Rasagiline: (Moderate) The concomitant use of rasagiline and sympathomimetic agents was not allowed in clinical studies; therefore, caution is advised during concurrent use of rasagiline and respiratory adrenergic agents (e.g., the beta-agonists). Although sympathomimetic agents are contraindicated for use with traditional non-selective monoamine oxidase inhibitors (MAOIs), hypertensive reactions generally are not expected to occur during concurrent use with rasagiline because of the selective monoamine oxidase-B (MAO-B) inhibition of rasagiline at manufacturer recommended doses. However, the cardiovascular effects of beta-2 agonists may be potentiated by concomitant use of MAOIs. At least one case of hypertension occurred in a patient with previous episodes of high blood pressure who was receiving albuterol and selegiline, a selective MAOI related to rasagiline, concurrently. Close observation for such effects is prudent, particularly if beta-2 agonists are administered during or within 2 weeks of use of an MAOI.
Theophylline, Aminophylline: (Moderate) Beta-agonists are commonly used in conjunction with aminophylline or theophylline therapy. Concomitant use can cause additive CNS stimulation; some patients may experience tremor or nervousness with combined use. More serious effects are rare, but may result in additive cardiovascular effects such as increased blood pressure and heart rate. Methylxanthine derivatives, ((e.g., theophylline and aminophylline) may rarely aggravate the hypokalemic effect seen with beta-agonists. Consider checking potassium levels if clinically indicated. (Moderate) Beta-agonists are commonly used in conjunction with aminophylline or theophylline therapy. Concomitant use can cause additive CNS stimulation; some patients may experience tremor or nervousness with combined use. More serious effects are rare, but may result in additive cardiovascular effects such as increased blood pressure and heart rate. Methylxanthine derivatives, (e.g., theophylline, aminophylline) may rarely aggravate the hypokalemic effect seen with beta-agonists. Consider checking potassium levels if clinically indicated.
Thiazide diuretics: (Minor) Hypokalemia associated with 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 unknown, use caution when coadministering beta-agonists with thiazide diuretics and monitor serum potassium as clinically indicated.
Thyroid hormones: (Moderate) Monitor blood pressure and heart rate during concomitant beta-agonist and thyroid hormone use. Concurrent use may increase the effects of sympathomimetics or thyroid hormone. Thyroid hormones may increase the risk of coronary insufficiency when sympathomimetic agents are administered to patients with coronary artery disease.
Timolol: (Moderate) Beta-blockers will block the pulmonary effects of inhaled beta-agonists, and in some cases may exacerbate bronchospasm in patients with reactive airways. Beta-agonists can sometimes increase heart rate or have other cardiovascular effects, particularly when used in high doses or if hypokalemia is present. Use of a beta-1-selective (cardioselective) beta blocker is recommended whenever possible when this combination of drugs must be used together. Monitor the patient's lung and cardiovascular status closely. Beta-agonists and beta-blockers are pharmacologic opposites and will counteract each other to some extent when given concomitantly, especially when non-cardioselective beta blockers are used.
Torsemide: (Moderate) Use beta-agonists and loop diuretics with caution due to risk for ECG changes and/or hypokalemia. The ECG changes and/or hypokalemia that may result from administration of loop diuretics can be acutely worsened by beta-agonists, especially when the recommended dose of the beta-agonist is exceeded.
Tranylcypromine: (Moderate) Use beta-agonists with caution in patients receiving concomitant monoamine oxidase inhibitors (MAOIs) or within 14 days of stopping treatment with MAOIs because the action of beta-agonists on the cardiovascular system may be potentiated.

Alupent/Metaproterenol Sulfate Respiratory (Inhalation) Sol: 0.4%, 0.6%
Metaproterenol Sulfate Oral Sol: 5mL, 10mg

80 mg/day PO; oral inhalation maximum dependent on formulation used.

80 mg/day PO; oral inhalation maximum dependent on formulation used.

80 mg/day PO; oral inhalation maximum dependent on formulation used.

> 9 years or > 60 lb (27.3 kg): 80 mg/day PO; oral inhalation maximum dependent on formulation used.
6—9 years or < 60 lb (27.3 kg): 40 mg/day PO; oral inhalation maximum dependent on formulation used.
< 6 years: Safety and efficacy have not been established.

Safety and efficacy have not been established.

Mechanism of Action: Metaproterenol is a moderately selective beta- adrenergic agonist that stimulates receptors of the smooth muscle in the lungs, uterus, and vasculature supplying skeletal muscle, with minimal or no effect on alpha-adrenergic receptors. Intracellularly, the actions of metaproterenol are mediated by cAMP, the production of which is augmented by beta stimulation. The drug is believed to work by activating adenylate cyclase, the enzyme responsible for producing the cellular mediator cAMP.Binding of metaproterenol to beta-2 receptors in the lungs causes relaxation of bronchial smooth muscles, which in turn relieves bronchospasm, reduces airway resistance, facilitates mucous drainage, and increases vital capacity. Metaproterenol can inhibit degranulation and release of inflammatory autocoids from mast cells. Actions on peripheral vascular smooth muscle cause vasodilation and a modest decrease in diastolic blood pressure.Beta-2 adrenergic stimulation also results in intracellular accumulation of serum potassium, possibly due to stimulation of the Na/K ATPase pump, and can cause moderate decreases in serum potassium concentrations. Metaproterenol is believed to produce a less pronounced decrease in arterial oxygen tension than does isoproterenol.

Metoproterenol is administered orally or via oral inhalation and nebulization. Metaproterenol is excreted renally, mainly as glucuronide conjugates.

Although metaproterenol is well absorbed from the GI tract, the drug is extensively metabolized by the liver on first pass, resulting in an oral bioavailability of 40%. The onset of action is within 15—30 minutes following oral administration. The peak effects are seen within about 1 hour after oral administration. Effects can last up to 4 hours after a single dose given orally, but the duration of action can decrease with prolonged use secondary to tachyphylaxis.

The onset of action is within 1 minute after oral inhalation and 5—30 minutes after nebulization of metaproterenol. The peak effects are seen within about 1 hour after inhalation. Effects can last up to 4 hours after a single dose given by inhalation, but the duration of action can decrease with prolonged use secondary to tachyphylaxis.

It is not known if metaproterenol is excreted into breast milk; according to the manufacturer, caution must be exercised in breast-feeding mothers who may require metaproterenol. Metaproterenol via inhaled administration typically results in low systemic concentrations; therefore, it is unlikely that nursing infants would be exposed to clinically significant amounts via breast milk. According to the 2004 recommendations of the National Asthma Education and Prevention Program for managing asthma during pregnancy, there is currently no contraindication for use of short-acting inhaled beta2-agonists during lactation. Consider the benefits of breast-feeding, the risk of potential infant drug exposure, and the risk of an untreated or inadequately treated condition. If a breast-feeding infant experiences an adverse effect related to a maternally administered drug, healthcare providers are encouraged to report the adverse effect to the FDA.