In what form is Pirbuterol available?

Pirbuterol is primarily available in the form of a metered-dose inhaler (MDI). This delivery system allows the medication to be delivered directly to the lungs, which is crucial for quick relief of asthma symptoms. MDIs are designed to provide precise doses of medication with each actuation, making it easier for patients to use as directed and facilitating better management of respiratory conditions like asthma.

While other forms of medication may exist for different drugs or for other treatments, in the case of Pirbuterol, its formulation as an MDI is specifically intended for its role as a bronchodilator for asthma, providing rapid relief from constricted airways. The other options refer to different delivery mechanisms that may be used for other medications but do not apply to Pirbuterol in this context.