Phytotherapeutic Agents & Herbal Medicinal Drugs
Phytotherapy is the science of using plant-derived medications for disease prevention and treatment. In this high-yield concluding unit of Pharmacognosy, we cover the biological source, botanical family, major active chemical constituents, and therapeutic indications of 20 essential medicinal plants prescribed in the PCI syllabus, organized neatly by clinical therapeutic class.
Master Pharmacognostic Profiles of Prescribed Herbal Drugs
Simple Definition & Overview:
Phytotherapeutic Agents (Herbal Drugs) are defined as standardized medicinal products, extracts, or isolated active chemical principles derived from plants used for preventing, managing, or curing human diseases.
• It is defined as: The dried mature root of Withania somnifera (Family: Solanaceae).
• It is also known as: Indian Ginseng or Asgandh.
• It is used for: Relieving stress/anxiety, restoring physical stamina, and boosting immunity (Withanolides).
• It is defined as: The fresh and dried leaves of Ocimum sanctum (Family: Lamiaceae).
• It is also known as: Queen of herbs or Holy Basil.
• It is used for: Treating respiratory cough, colds, asthma, and viral fever (Eugenol).
• It is defined as: The dried leaves of Digitalis purpurea (Family: Plantaginaceae).
• It is also known as: Foxglove leaf.
• It is used for: Treating congestive heart failure and atrial arrhythmias (Digoxin / Digitoxin).
• It is defined as: The dried roots of Rauwolfia serpentina (Family: Apocynaceae).
• It is also known as: Snake root or Sarpagandha.
• It is used for: Lowering high blood pressure (antihypertensive) and calming neuropsychiatric agitation (Reserpine).
• It is defined as: The dried rhizome of Curcuma longa (Family: Zingiberaceae).
• It is also known as: Haldi, Indian Saffron, or the Golden Spice.
• It is used for: Relieving inflammation, healing wounds, and liver protection (Curcuminoids).
• It is defined as: The dried flower buds of Syzygium aromaticum (Family: Myrtaceae).
• It is also known as: Laung or Caryophyllum.
• It is used for: Relieving severe toothache (dental analgesic) and mouth antiseptic (Eugenol).
| Therapeutic Class | Drug Common Name | Biological Source & Family | Major Active Constituents | Primary Therapeutic Uses |
|---|---|---|---|---|
| 1. Adaptogens & Immunomodulators | Ashwagandha | Dried roots of Withania somnifera (Solanaceae) | Withanolides (Withaferin A, Withanolide D) | Potent adaptogen, anti-stress, nervous restorative, improves physical stamina. |
| Tulsi (Holy Basil) | Fresh and dried leaves of Ocimum sanctum (Lamiaceae) | Eugenol (70%), β-caryophyllene, Ursolic acid | Immunomodulator, antiviral, antibacterial, relieves cough, bronchitis, and colds. | |
| Amla (Indian Gooseberry) | Fresh and dried fruits of Phyllanthus emblica (Euphorbiaceae) | Vitamin C (Ascorbic acid), Gallic acid, Emblicanin | Super antioxidant, boosts WBC immunity, key component of Chyawanprash. | |
| 2. Hepatoprotectives (Liver Tonics) | Milk Thistle | Ripe seeds of Silybum marianum (Asteraceae) | Silymarin complex (Silybin, Silydianin, Silychristin) | Protects hepatocytes from toxin damage, promotes liver regeneration in cirrhosis and hepatitis. |
| Kutki | Dried rhizomes of Picrorhiza kurroa (Scrophulariaceae) | Picroside-I, Picroside-II, and Kutkoside | Bitter stomachic, stimulates bile secretion (choleretic), treats jaundice. | |
| 3. Cardiovascular & Antidiabetic | Garlic | Fresh bulbs of Allium sativum (Amaryllidaceae/Liliaceae) | Alliin → converted by Alliinase to Allicin, Ajoene | Lowers serum cholesterol/triglycerides, antihypertensive, inhibits platelet aggregation. |
| Arjuna | Dried stem bark of Terminalia arjuna (Combretaceae) | Arjunic acid, Arjunolic acid, Tannins | Cardiotonic, inotropic support for congestive heart failure, anti-anginal. | |
| Gymnema (Gurmar) | Leaves of Gymnema sylvestre (Apocynaceae) | Gymnemic acids | "Sugar Destroyer": abolishes sweet taste perception on tongue, regenerates pancreatic beta cells. | |
| Fenugreek (Methi) | Dried seeds of Trigonella foenum-graecum (Fabaceae) | 4-Hydroxyisoleucine, Trigonelline, Galactomannan | Stimulates glucose-dependent insulin secretion; reduces postprandial blood sugar spikes. | |
| 4. Anti-inflammatory & CNS | Turmeric (Haldi) | Dried rhizomes of Curcuma longa (Zingiberaceae) | Curcuminoids (Curcumin I, II, III, 3%–5%) | Potent natural COX-2 inhibitor, treats rheumatoid arthritis, wound healing, antioxidant. |
| Boswellia (Salai Guggul) | Oleogum resin of Boswellia serrata (Burseraceae) | β-Boswellic acid, AKBA (Acetyl-11-keto-β-boswellic acid) | Specific 5-Lipoxygenase (5-LOX) inhibitor; relieves joint inflammation in osteoarthritis without ulcer risk. | |
| Brahmi | Whole herb of Bacopa monnieri (Plantaginaceae) | Bacosides (Bacoside A & B) | Medhya Rasayana (memory enhancer, nootropic), improves cerebral cholinergic transmission. | |
| 5. Antimicrobial, Antiviral & GI | Giloy (Guduchi) | Dried stems of Tinospora cordifolia (Menispermaceae) | Tinosporine, Cordifolioside A, Berberine | Potent antipyretic in chronic fevers; stimulates thrombocyte (platelet) production in dengue. |
| Neem | Leaves, bark, seeds of Azadirachta indica (Meliaceae) | Azadirachtin, Nimbin, Nimbidin | Broad-spectrum antibacterial, antifungal, anti-acne, natural insecticide. | |
| Andrographis (Kalmegh) | Aerial parts of Andrographis paniculata (Acanthaceae) | Andrographolide (diterpene lactone) | "King of Bitters", clinical antiviral for upper respiratory tract colds and tonsillitis. | |
| Psyllium (Isabgol) | Dried seed husks of Plantago ovata (Plantaginaceae) | Arabinoxylan mucilage (high swelling index ≥ 40) | Bulk-forming gentle laxative, relieves constipation, lowers blood cholesterol. | |
| 6. Skin, Women's Health & Respiratory | Aloe (Ghritkumari) | Fresh mucilaginous leaf gel of Aloe vera (Asphodelaceae) | Acemannan polysaccharide, Aloin (anthraquinone in latex) | Accelerates thermal burn healing, deep skin moisturizing, anti-inflammatory. |
| Shatavari | Dried tuberous roots of Asparagus racemosus (Asparagaceae) | Shatavarins (I to IV steroidal saponins) | Female reproductive tonic, potent galactagogue (enhances prolactin and lactation). | |
| Chasteberry | Dried ripe fruits of Vitex agnus-castus (Lamiaceae) | Agnuside, Casticin, Aucubin | Balances estrogen/progesterone ratio; treats premenstrual syndrome (PMS) and mastalgia. | |
| Vasaka | Dried leaves of Adhatoda vasica (Acanthaceae) | Vasicine, Vasicinone (Quinazoline alkaloids) | Potent bronchodilator & expectorant. Natural chemical template for synthetic Bromhexine and Ambroxol! |