Delivery
All β2 agonists are available in inhaler form, either metered-dose inhalers, which aerosolize the drug, or dry powder, which can be inhaled.
Salbutamol (known as albuterol in the U.S.) also comes in a solution form for nebulization, which is more commonly used in inhalers than in emergency rooms. Salbutamol and terbutaline are also both available in oral forms. Nebuliser form is as effective as administering the drug intravenously.
In addition, several of these medications are available in intravenous forms, including both salbutamol and terbutaline. It can be used in this form in severe cases of asthma, but it is more commonly used to suppress premature labor because it also relaxes uterine muscle, thereby inhibiting contractions.
Read more about this topic: Beta2-adrenergic Agonist
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