Which agent acts as an alpha and beta adrenergic agonist?

Which agent acts as an alpha and beta adrenergic agonist?

• A. Non-Selective Beta Agonist
• B. Alpha-1 Agonist
• C. Beta-2 Agonist
• D. Alpha and Beta Agonist

Answer: (D)

Adrenergic agonists can target different receptor subtypes, either selectively or across multiple families. An agent that activates both alpha and beta receptors is an alpha and beta adrenergic agonist, giving a combination of actions from both receptor types. Epinephrine is the classic example, binding alpha1 (causing vasoconstriction) and beta1 (increasing heart rate and contractility) as well as beta2 (bronchodilation). This broad activity across receptor classes is what defines an alpha and beta agonist. The other options describe drugs that primarily target only one receptor family: a beta-selective agent stimulates beta receptors without alpha activity; an alpha-selective agent stimulates alpha receptors without beta; a beta2-selective agent mainly affects beta2 with little to no alpha activity.

Adrenergic agonists can target different receptor subtypes, either selectively or across multiple families. An agent that activates both alpha and beta receptors is an alpha and beta adrenergic agonist, giving a combination of actions from both receptor types. Epinephrine is the classic example, binding alpha1 (causing vasoconstriction) and beta1 (increasing heart rate and contractility) as well as beta2 (bronchodilation). This broad activity across receptor classes is what defines an alpha and beta agonist.

The other options describe drugs that primarily target only one receptor family: a beta-selective agent stimulates beta receptors without alpha activity; an alpha-selective agent stimulates alpha receptors without beta; a beta2-selective agent mainly affects beta2 with little to no alpha activity.