Drug Interactions Explained: Matching Combinations and Effects

This question requires matching drug combinations from LIST-I with their corresponding interactions or effects from LIST-II. Let's analyze each pair based on known pharmacological interactions:

A. Penicillamine with Aluminum-containing antacids

Penicillamine can form poorly soluble complexes with metal cations like aluminum. This interaction leads to a significant reduction in the absorption of penicillamine from the gastrointestinal tract.

Match: A-III (Formulation of poorly soluble complex)

B. Lithium carbonate with Atropine

Atropine, an anticholinergic agent, slows down gastrointestinal motility, including delaying gastric emptying. This can alter the absorption profile of orally administered drugs like lithium carbonate.

Match: B-II (Delayed gastric emptying)

C. Oral contraceptives with Ampicillin

Certain antibiotics, including ampicillin, can potentially reduce the efficacy of oral contraceptives. This is often attributed to alterations in the gut flora, affecting the enterohepatic circulation of estrogens, or potentially other mechanisms leading to reduced systemic levels or effectiveness.

Match: C-IV (Decreased reabsorption of drug) - This implies a reduced effectiveness or altered level of the contraceptive components.

D. Amitriptyline with Phenobarbitone

Phenobarbitone is a potent enzyme inducer (e.g., CYP450 enzymes) in the liver. It can significantly increase the metabolism of amitriptyline (a tricyclic antidepressant), leading to lower plasma concentrations of amitriptyline.

Match: D-I (Decreased plasma level)

Correct Matching Summary

Based on the analysis, the correct matching is:

• A - III
• B - II
• C - IV
• D - I

This corresponds to Option B.