Which term describes medications having effects at different sites in the body?

• A. Multiple Actions
• B. Single Action
• C. Sequential Action
• D. Localized Action

Answer: (A)

Medications with effects at different sites are described as having multiple actions. This occurs when a drug spreads systemically or interacts with receptors in several tissues, producing more than one physiological response. For example, epinephrine acts on beta-1 receptors to increase heart rate and contractility, on beta-2 receptors to cause bronchodilation, and on alpha receptors to cause vasoconstriction—all at once. Localized action would mean the effect is confined to the administration site, while single action refers to effects at a single tissue. Sequential action isn’t a standard descriptor for how a drug works across multiple sites.