BP105T Unit 1 – Introduction, Scope & Classification of Crude Drugs
Unit 1 introduces Pharmacognosy — the study of crude drugs from natural plant, animal, and mineral sources. It details the historical evolution from ancient civilizations (Ebers Papyrus, Shen Nung, Dioscorides, Seydler 1815), modern multidisciplinary scope in drug discovery, and foundational principles of Indigenous Systems of Medicine: Ayurveda (Tridosha & Panchamahabhuta theory), Siddha, Unani (Humoral theory), and Homeopathy.
📋 Prescribed Syllabus Topics
📖 Detailed Lecture Notes & Solved Examples
11. Etymology, Definition & Historical Evolution of Pharmacognosy
Dedicated Webpage➔The term 'Pharmacognosy' was coined in 1815 by German medical student Christian Athanasius Seydler in his doctoral dissertation entitled 'Analecta Pharmacognostica'. The word derives from two Greek roots: 'pharmakon' (meaning drug or remedy) and 'gnosis' (meaning knowledge or study). Pharmacognosy is defined as the scientific study of the structural, physical, chemical, and biological properties of crude drugs and active pharmaceutical substances derived from natural origins (plants, animals, microorganisms, and minerals).Pharmacognosy do Greek shabdon se bana hai: 'Pharmakon' (dawa) aur 'Gnosis' (gyan/knowledge). Ye naam 1815 me C.A. Seydler ne diya tha. Iska matlab hai natural sources (ped-paudhe, janwar, khaneej) se milne wali kacchi dawaiyon (Crude Drugs) ki chemical aur medical study karna.
▶Historical Chronology of Natural Medicine Pioneers
From ancient herbal compendia to pure chemical molecule isolation.
| Historical Figure / Document | Era / Year | Major Contribution | Key Natural Drug Identified |
|---|---|---|---|
| Papyrus Ebers | 1550 BCE | Ancient Egyptian medical papyrus | Castor oil (laxative), Opium (analgesic) |
| Dioscorides | 77 CE | Authored 'De Materia Medica' | Over 600 medicinal plants cataloged |
| Galen | 130 - 200 CE | Compounded vegetable extracts | Galenical formulations & cold creams |
| Friedrich Sertürner | 1806 | Isolated first pure alkaloid | Morphine from Papaver somniferum |
| C.A. Seydler | 1815 | Coined term 'Pharmacognosy' | Analecta Pharmacognostica (dissertation) |
- •Crude Drug: Any naturally occurring, unrefined substance derived from organic (plant/animal) or inorganic (mineral) sources that possesses therapeutic value.
- •C.A. Seydler (1815): Coined 'Pharmacognosy' in his work 'Analecta Pharmacognostica'.
- •Scope in Modern Pharmacy: Structural scaffolds for synthetic drugs (e.g. Quinine -> Chloroquine, Salicin -> Aspirin), herbal standardized extracts, nutraceuticals, phytopharmaceuticals, and bio-guided fractionation.
22. The Ayurvedic System of Medicine: Panchamahabhuta & Tridosha Theory
Dedicated Webpage➔Ayurveda (Sanskrit: 'Ayur' = Life, 'Veda' = Science / Knowledge) is an ancient holistic Indian system of medicine originating over 5,000 years ago in the Vedic scriptures (Atharva Veda, Charaka Samhita, Sushruta Samhita). Ayurveda posits that the universe and the human body are composed of five fundamental physical elements (Panchamahabhuta: Prithvi/Earth, Jala/Water, Agni/Fire, Vayu/Air, and Akasha/Ether). In living organisms, these five elements combine into three primary physiological regulatory humors called the Tridoshas: Vata (governs movement and nervous impulses), Pitta (governs digestion, metabolism, and heat), and Kapha (governs structural stability, lubrication, and immunity). Health (Swasthya) is the dynamic equilibrium of the Tridoshas, and disease (Vyadhi) results from their imbalance.Ayurveda me shareer 5 tatvon (Panchamahabhuta) aur 3 doshon (Vata = Hawa/Movement, Pitta = Aag/Digestion, Kapha = Paani/Structure) se bana hota hai. Inka santulan hi swasthya hai. Asava aur Arishta fermented liquid medicines hain jinme self-generated alcohol natural preservative ka kaam karta hai. Bhasma pure metals ki nano-ash hoti hai.
▶Traditional Ayurvedic Dosage Forms (Kalpanas)
Classification and processing of classical Ayurvedic formulations.
| Dosha | Elemental Composition | Governing Physiological Function | Manifestation of Imbalance |
|---|---|---|---|
| Vata | Vayu (Air) + Akasha (Ether) | Cellular movement, breathing, nerve transmission | Constipation, anxiety, joint tremors, dry skin |
| Pitta | Agni (Fire) + Jala (Water) | Digestion, enzymatic transformation, body heat | Acid reflux, inflammation, ulcers, skin rashes |
| Kapha | Prithvi (Earth) + Jala (Water) | Structural cohesion, lubrication, cellular immunity | Lethargy, obesity, congestion, excessive mucus |
- •Tridoshas: Vata ($Vayu + Akasha$), Pitta ($Agni + Jala$), Kapha ($Prithvi + Jala$).
- •Sapta Dhatus (7 Fundamental Tissues): Rasa (plasma), Rakta (blood), Mamsa (muscle), Meda (fat), Asthi (bone), Majja (marrow), Shukra (reproductive fluids).
- •Triphala: Classical polyherbal rasayana consisting of equal parts of Terminalia chebula (Haritaki), Terminalia bellirica (Bibhitaki), and Phyllanthus emblica (Amla).
33. Siddha, Unani & Homeopathic Systems of Medicine
Dedicated Webpage➔The Siddha system (originating in South India via 18 Siddhars, notably Agasthiyar) emphasizes mineral and metallic therapeutics (Muppu) aligned with 96 fundamental principles. The Unani-Tibb system (originating in ancient Greece via Hippocrates and Galen, formalized by Avicenna / Ibn Sina in the Canon of Medicine) is founded on the Humoral Theory: health requires balance among four bodily humors (Akhlaat: Dam/Blood, Balgham/Phlegm, Safra/Yellow Bile, and Sauda/Black Bile). The Homeopathic system was founded in Germany in 1796 by Dr. Samuel Hahnemann on the central doctrine 'Similia Similibus Curentur' ('Like Cures Like') and the Law of Potentization (serial decimal 'X' or centesimal 'C' dilutions combined with vigorous succussion / dynamization).Unani system 4 humors (Dam = Blood, Balgham = Phlegm, Safra = Yellow bile, Sauda = Black bile) par based hai jise Ibn Sina ne aage badhaya. Homeopathy ko Dr. Samuel Hahnemann ne 1796 me shuru kiya jiska niyam hai 'Similia Similibus Curentur' (jisse rog paida ho wahi use theek karega) aur Potentization (extreme dilution + succussion).
▶Core Principles of Traditional Medical Systems
Key philosophical doctrines and formulation methods.
- •Unani: Canon of Medicine by Ibn Sina (Avicenna); 4 Humors (Dam, Balgham, Safra, Sauda).
- •Homeopathy: Founded by Samuel Hahnemann (1796); Organon of Medicine; 'Similia Similibus Curentur'.
- •Mother Tincture ($Q$): The concentrated ethanolic extract of a drug used as the starting point for homeopathic potentization.
- In a 10-mark question on Indigenous Systems of Medicine, compare Ayurveda (Tridosha/Panchamahabhuta), Unani (4 Humors), and Homeopathy (Hahnemann's Law of Similars) in structured sections.
- Explain the preparation and clinical merits of Ayurvedic Asavas and Arishtas.