What is a Type D ADR?

What is a Type D ADR?

• A. Delayed, time related (becomes apparent sometime after use)
• B. Immediate hypersensitivity
• C. Dose-related
• D. Bizarre, unpredictable

Answer: (A)

Type D adverse drug reactions are delayed, time-related effects that don’t show up right away but emerge after a period of exposure (often months or years) and can even appear after the drug has been stopped. This distinguishes them from reactions that are immediate, or from those that are simply dose-related and predictable with how much drug is given. An example you might see discussed is tardive dyskinesia from long-term antipsychotic use, which can develop after extended therapy and may persist after discontinuation. So the best description matches a delayed, time-related onset rather than an immediate, dose-dependent, or unpredictable acute event.

Type D adverse drug reactions are delayed, time-related effects that don’t show up right away but emerge after a period of exposure (often months or years) and can even appear after the drug has been stopped. This distinguishes them from reactions that are immediate, or from those that are simply dose-related and predictable with how much drug is given. An example you might see discussed is tardive dyskinesia from long-term antipsychotic use, which can develop after extended therapy and may persist after discontinuation. So the best description matches a delayed, time-related onset rather than an immediate, dose-dependent, or unpredictable acute event.