BP102T • Unit 4Topic 1 of 3⏱ 5 Min Read

1. Pharmaceutical Powders: Classification & Geometric Dilution

💡 Core Concept & Clinical Context:

A pharmaceutical powder is a dry, solid substance composed of finely divided particles (10 nm to 1000 μm) intended for internal or external use. Powders offer rapid dissolution and rapid therapeutic onset compared to compressed tablets. When mixing a potent, small-quantity drug (e.g. 10 mg) with a large bulk of diluent (e.g. 990 mg of lactose), simple mixing causes non-uniform distribution. The Geometric Dilution Method ensures homogeneous blending by mixing the potent drug with an equal weight of diluent, then doubling the quantity of diluent at each successive blending stage.

Clinical Scenarios & Pharmacopoeial Examples:

1Geometric Dilution Compounding Procedure for Potent Powders

Compounding 50 mg of Atropine sulphate with 950 mg of Lactose (Total = 1000 mg).

Step-by-Step Breakdown:

•Step 1: Place 50 mg Atropine in mortar.

•Step 2: Add 50 mg Lactose (equal weight). Triturate thoroughly -> Subtotal: 100 mg.

•Step 3: Add 100 mg Lactose (equal weight). Triturate thoroughly -> Subtotal: 200 mg.

•Step 4: Add 200 mg Lactose (equal weight). Triturate thoroughly -> Subtotal: 400 mg.

•Step 5: Add 400 mg Lactose (equal weight). Triturate thoroughly -> Subtotal: 800 mg.

•Step 6: Add remaining 200 mg Lactose. Final thorough trituration -> 1000 mg homogeneous blend.

📋Key Takeaways & Exam Highlights

Classification of Powders: Simple powders (single drug), Compound powders (multiple drugs), Dusting powders (external), Effervescent powders, Insufflations (blown into ear/nose/throat).
Hygroscopic Powders: Absorb atmospheric moisture without liquefying (e.g. Pepsin, Calcium chloride).
Deliquescent Powders: Absorb moisture and dissolve completely into a liquid solution (e.g. Potassium citrate).
Efflorescent Powders: Release crystalline water of hydration into the atmosphere, turning into dry powder (e.g. Borax, Sodium sulphate, Citric acid monohydrate).

🇮🇳 हिन्दी व्याख्या (1. Pharmaceutical Powders: Classification & Geometric Dilution)

जियोमेट्रिक डाइल्यूशन (Geometric Dilution) वह तरीका है जिससे बहुत कम मात्रा वाली तेज असरदार दवा को अधिक मात्रा वाले पाउडर में बराबर-बराबर अनुपात में मिलाकर एक समान मिश्रण बनाया जाता है।