To determine which drug class is correctly matched with the criteria of drug classification, we examine the provided options:
- Analgesics ----- molecular targets: Analgesics are primarily classified by their effect in relieving pain rather than specific molecular targets. Therefore, this classification does not accurately match.
- Sulphonamides ----- drug action: Sulphonamides, which are antimicrobial agents, are typically classified by their mechanism of action, not just their action, making this a partial mismatch.
- Antihistamines ----- chemical structure: Antihistamines are grouped by their ability to block histamine at its receptors rather than simply by their chemical structure. Thus, this is not the correct classification criterion.
- Antiseptics ----- pharmacological effect: Antiseptics are substances that inhibit the growth and development of microorganisms on living tissues, classified based on their pharmacological effect. This classification is correct.
Based on the analysis above, the correct answer is:
Antiseptics ----- pharmacological effect