Which statements characterize Type A ADRs?

Which statements characterize Type A ADRs?

• A. Rare and unpredictable
• B. Immunologic mechanism
• C. Not dose-related
• D. Common and responsible for the majority of adverse effects; usually dose dependent and predictable, but can be due to concomitant disease-states, drug-drug interactions, or drug-food interaction

Answer: (D)

Type A adverse drug reactions are augmented, dose-related, and predictable effects that arise from the drug’s normal pharmacologic action or an exaggerated secondary effect. Because they track with the dose, lowering the dose or stopping the drug often reduces or resolves them, making these reactions predictable and manageable. They are the most common ADRs, and their frequency or severity can be increased by factors such as existing disease states, drug–drug interactions that raise drug levels or enhance effects, or drug–food interactions that alter absorption or metabolism. Examples include hypoglycemia with insulin or sulfonylureas, sedation with opioids or benzodiazepines, orthostatic hypotension with certain antihypertensives, and GI irritation with NSAIDs or bleeding risk with anticoagulants when other interacting drugs or foods are involved. In contrast, immunologic or idiosyncratic reactions are not dose-related and are less predictable, which is why those would not fit the Type A pattern.

Type A adverse drug reactions are augmented, dose-related, and predictable effects that arise from the drug’s normal pharmacologic action or an exaggerated secondary effect. Because they track with the dose, lowering the dose or stopping the drug often reduces or resolves them, making these reactions predictable and manageable. They are the most common ADRs, and their frequency or severity can be increased by factors such as existing disease states, drug–drug interactions that raise drug levels or enhance effects, or drug–food interactions that alter absorption or metabolism. Examples include hypoglycemia with insulin or sulfonylureas, sedation with opioids or benzodiazepines, orthostatic hypotension with certain antihypertensives, and GI irritation with NSAIDs or bleeding risk with anticoagulants when other interacting drugs or foods are involved. In contrast, immunologic or idiosyncratic reactions are not dose-related and are less predictable, which is why those would not fit the Type A pattern.