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Types of Bronchodilators

Anticholinergics
Anticholinergics

Anticholinergic bronchodilators (or muscarinic receptor antagonists) block the parasympathetic nerve reflexes that cause the airways to constrict, so allow the air passages to remain open. Muscarinic receptor antagonists bind to muscarinic receptors and inhibit acetylcholine mediated bronchospasm.

source: drugs.com
Beta-2 Agonists
Beta-2 Agonists

Beta2-agonists (bronchodilators) are a group of drugs prescribed to treat asthma. Short-acting beta-agonists (SABAs) provide quick relief of asthma symptoms. They can also be prescribed to be taken before exercising in order to prevent exercise-induced bronchoconstriction.

source: aaaai.org
Theophylline
Theophylline

Aminophylline and theophylline may also be used for other conditions as determined by your doctor. The oral liquid, tablet, and capsule dosage forms of these medicines may be used for treatment of the acute attack or for chronic long-term treatment.

source: drugs.com