Allergic reaction is sometimes called hypersensitivity and is an example of which of the following?

Allergic reaction is sometimes called hypersensitivity and is an example of which of the following?

• A. An idiosyncratic drug reaction
• B. A local reaction
• C. A beneficial effect
• D. A predictable reaction

Answer: (A)

Allergic reactions, or hypersensitivity, are immune-driven adverse drug reactions that are not predictable from the drug’s usual effects and are not dose-dependent. Because they are unpredictable and stem from an individual’s immune response, they’re best described as an idiosyncratic drug reaction. Local reactions are confined to the injection site and aren’t the general, immune-mediated response described here. A beneficial effect isn’t an adverse or hypersensitivity reaction. A predictable reaction follows the drug’s known actions or occurs in a dose-related way, which hypersensitivity is not. So hypersensitivity fits as an idiosyncratic drug reaction.

Allergic reactions, or hypersensitivity, are immune-driven adverse drug reactions that are not predictable from the drug’s usual effects and are not dose-dependent. Because they are unpredictable and stem from an individual’s immune response, they’re best described as an idiosyncratic drug reaction. Local reactions are confined to the injection site and aren’t the general, immune-mediated response described here. A beneficial effect isn’t an adverse or hypersensitivity reaction. A predictable reaction follows the drug’s known actions or occurs in a dose-related way, which hypersensitivity is not. So hypersensitivity fits as an idiosyncratic drug reaction.