Step 1: Understanding the Concept:
Alkaloids (like morphine, strychnine, or atropine) are potent plant-based nitrogenous compounds. In case of poisoning, the goal is to prevent their absorption from the stomach.
Step 2: Detailed Explanation:
1. Mechanism of Activated Charcoal: It is a "universal antidote" that works via Adsorption. It has an incredibly high surface area and porous structure.
2. Action: It binds to the alkaloid molecules in the gastrointestinal tract, preventing them from being absorbed into the bloodstream. The charcoal-toxin complex is then excreted in the feces.
3. Others: Sodium thiosulphate and Sodium nitrate are specifically used for Cyanide poisoning, not alkaloidal poisoning.
Step 3: Final Answer:
Activated charcoal is the standard adsorbent used in the emergency treatment of various oral poisonings, including those caused by alkaloids.