Northeastern U.S. Children Show Signs of Worse Asthma in Wildfire Smoke
December 12, 2025
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Brand Name :
N/A
Synonyms :
clenbuterol
Class :
Beta2-Adrenergic Agonist
Brand Name :
N/A
Synonyms :
clenbuterol
Class :
Beta2-Adrenergic Agonist
Dosage Forms & Strengths
Tablet
10 mcg
Chronic Obstructive Pulmonary Disease (COPD)Â
Take a dose of 20 mcg orally two times a day
Daily dose should not be more than 60 mcg
not indicated
refer adult dosing
Actions and Spectrum
clenbuterol acts as a selective beta-2 adrenergic agonist thus it stimulates the beta-2 adrenergic receptors in the smooth muscles of the bronchioles in the lungs.
clenbuterol also affects beta-1 adrenergic receptors, which are present in the heart. The spectrum of activity primarily involves its effects on beta-adrenergic receptors, particularly the beta-2 adrenergic receptors.
Frequency not defined
None
Black Box Warning
None
Contraindication/Caution:
Contraindication:
Caution:
Pregnancy consideration:
Pregnancy category: N/A
Lactation: Excretion into human milk is unknown
Pregnancy Categories:     
Category A: well-controlled and Satisfactory studies show no risk to the fetus in the first or later trimester.
Category B: there was no evidence of risk to the fetus in animal studies, and there were not enough studies on pregnant women.
Category C: there was evidence of risk of adverse effects in animal reproduction studies, and no adequate evidence in human studies must take care of potential risks in pregnant women.
Category D: adequate data with sufficient evidence of human fetal risk from various platforms, but despite the potential risk, and used only in emergency cases for potential benefits.
Category X: Drugs listed in this category outweigh the risks over benefits. Hence these categories of drugs need to be avoided by pregnant women.
Category N: There is no data available for the drug under this category.
Pharmacology
clenbuterol is a selective beta-2 adrenergic receptor in the body. These receptors are mainly found in the smooth muscles of the bronchioles in the lungs and in the blood vessels.
clenbuterol also acts on beta-1 adrenergic receptors, which are present in the heart. Activation of these receptors leads to an increased heart rate and an increase in the force of heart contractions.
Pharmacodynamics
clenbuterol causes relaxation by stimulating beta-2 receptors in the smooth muscles of the bronchioles. This leads to bronchodilation, making it easier for individuals with respiratory conditions like asthma to breathe.
Pharmacokinetics
Absorption
clenbuterol is well-absorbed from the gastrointestinal tract after oral administration.
Distribution
clenbuterol is distributed throughout the body and has a large volume of distribution.
Metabolism
clenbuterol undergoes metabolism in the liver through various enzymatic pathways, including glucuronidation and sulfation.
Elimination and excretion
clenbuterol is primarily excreted in the urine. It has an elimination half-life of approximately 25 to 39 hours.
Administration
clenbuterol is available in tablet form for oral administration.
Patient information leaflet
Generic Name: clenbuterol
Why do we use clenbuterol?
clenbuterol is used as a bronchodilator to reduce symptoms of respiratory conditions, particularly asthma and chronic obstructive pulmonary disease (COPD).
clenbuterol is also used in management of stress urinary incontinence.
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