Question

Type B adverse drug reaction is -

• A. Augmented effect of drug
• B. Unpredictable bizarre reaction
• C. Effect seen on chronic use of drug
• D. Delayed effect of drug

Hint:

A to E: A is Augmented, B is Bizarre, C is Chronic, D is Delayed, E is End-of-use.

Answer 1

The Correct Option is B

Step 1: Recall the five-letter system used to sort drug toxicities. Each letter maps to a behaviour pattern of the reaction, and the question asks specifically about category B.

Step 2: Category B stands for $Bizarre$. The defining feature is that it cannot be foreseen from the drug's usual action and shows no clear link to the dose given. Allergic and idiosyncratic events fall here, for instance an anaphylactic shock after penicillin.

Step 3: Matching this to the options, the unpredictable bizarre reaction is the right pick.

Step 4: Eliminating distractors: a magnified pharmacological effect belongs to type A and is dose linked; harm appearing only after long continuous therapy is type C; an event surfacing long after exposure (teratogenicity, malignancy) is type D; and rebound on stopping is type E.

\[\boxed{\text{Unpredictable bizarre reaction}}\]