Which medication type is primarily used for quick relief of asthma symptoms?

Short-acting beta-agonists (SABAs) are the primary medications used for quick relief of asthma symptoms. Their mechanism of action involves stimulating the beta-2 adrenergic receptors in the smooth muscle of the airways, leading to bronchodilation. This rapid relaxation of the airway muscles occurs within minutes, providing almost immediate relief from acute bronchospasm.

SABAs are typically used in situations such as asthma attacks or episodes of wheezing, making them essential for rescue therapy. They are often referred to as "rescue inhalers," and their action generally lasts for 4 to 6 hours, allowing patients quick access to symptom relief on an as-needed basis.

Long-acting beta-agonists (LABAs), while effective for control of chronic asthma symptoms, do not provide immediate relief and are intended for maintenance therapy. Systemic corticosteroids are not used for quick relief; they are typically reserved for more severe exacerbations and work over a longer period to reduce inflammation. Leukotriene receptor antagonists also serve a preventive role in managing asthma but do not provide quick relief from acute symptoms.

Overall, the role of SABAs as quickly acting bronchodilators makes them the first choice in managing acute asthma symptoms.