Which among the following is NOT a classification criterion of drugs?

Question

Accepted Answer

Step-by-step explanation:

1. Common ways to classify drugs include their:
   - chemical structure (e.g., benzodiazepines, opioids),
   - molecular target or mechanism of action (e.g., beta-blockers target β-adrenergic receptors), and
   - pharmacological effect or therapeutic use (e.g., analgesics, antihypertensives).

2. These correspond to items $(1)$ Chemical structure, $(2)$ Molecular target, and $(4)$ Pharmacological effect — all valid classification criteria.

3. "Behavioural condition" (item $(3)$) describes a state or symptom of a patient (e.g., anxiety, depression) rather than a property used to classify the drugs themselves. While drugs may be used to treat behavioral conditions, the condition is not a formal criterion for drug classification in the same way as structure, target, or pharmacological effect.

Therefore the option that is NOT a classification criterion is item $(3)$, i.e. option c.

FINAL_ANSWER: c

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