These free B.Pharm notes on respiratory herbal drugs and vasaka cover chapter 30 of Introduction to Pharmacognosy, a first-semester subject. Read the key points below, then study the complete chapter PDF. You can browse every chapter in the Introduction to Pharmacognosy category.
Table of Contents
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Overview of respiratory herbal drugs and vasaka
This chapter covers natural drugs used for respiratory diseases such as cough, asthma and bronchitis. It gives their classification by action, mechanisms and important phytoconstituents. It then studies Vasaka in detail, covering its synonyms, source, morphology, chemical constituents and uses. These notes are useful for quick revision before exams.
Key points on respiratory herbal drugs and vasaka
- Respiratory herbal drugs are classified as expectorants and mucolytics, antitussives, bronchodilators and anti-asthmatics, anti-inflammatory and immunomodulatory drugs, and antimicrobial and antiviral drugs.
- Vasicine and vasicinone from Adhatoda vasica show bronchodilator and expectorant activities, while ephedrine from Ephedra promotes bronchodilation by stimulating adrenergic receptors.
- Vasaka consists of fresh or dried leaves and aerial parts of Adhatoda vasica, family Acanthaceae, also called Malabar Nut, Adulsa and Arusa.
- The major constituents of Vasaka are the quinazoline alkaloids vasicine, vasicinone, vasicinol, vasicinolone and deoxyvasicine.
- Vasaka is used in cough, bronchitis, asthma, whooping cough and tuberculosis, because vasicine and vasicinone relax bronchial muscles and liquefy thick sputum.
Relevance to pharmacy practice
Cough, cold and asthma are among the most frequent complaints seen in a pharmacy. Knowing how herbal expectorants and bronchodilators such as Vasaka act helps a pharmacist recommend and explain these products to patients.
Every chapter in this subject builds on the one before it, so do not skip topics that look simple. Definitions, classifications and examples are the parts that examiners return to most often, and a clear understanding here will also make later subjects easier to follow in the coming semesters.
Frequently asked questions on respiratory herbal drugs and vasaka
How are respiratory herbal drugs classified?
They are classified as expectorants and mucolytics, antitussives, bronchodilators and anti-asthmatics, anti-inflammatory and immunomodulatory drugs, and antimicrobial and antiviral drugs, each with plant examples.
What is the active constituent of Vasaka?
Vasicine and vasicinone, which are quinazoline alkaloids, are the main active constituents. They give the bronchodilator and expectorant action of Adhatoda vasica.
What is the biological source of Vasaka?
Vasaka is the fresh or dried leaves and aerial parts of Adhatoda vasica Nees (Justicia adhatoda Linn.), belonging to the family Acanthaceae.
Quick revision checklist
Use this self-test after reading the chapter on respiratory herbal drugs and vasaka. If you can do all of the following without looking at your notes, you are ready for the exam.
- I can explain: the classification of respiratory herbal drugs
- I can explain: how herbs relieve cough and asthma
- I can explain: the biological source of Vasaka
- I can explain: the chemical constituents of Vasaka
- I can explain: the uses of Vasaka
Study and exam tips
Start by reading the chapter once for the overall idea, then revise respiratory herbal drugs and vasaka using headings, definitions, classifications and examples. Short-answer questions in the university exam usually ask for definitions, features, advantages, disadvantages and examples, so write these in your own words and practise drawing the tables and flow charts that the chapter has.
For wider reading, standard textbooks and open resources such as the NCBI Bookshelf help you confirm terms and see more examples. Revise respiratory herbal drugs and vasaka again a day later and again a week later, because spaced revision improves long-term memory.
This page is part of the Introduction to Pharmacognosy series for first-semester B.Pharm students on B.Pharm Guru, where every chapter has a short summary and a full PDF. Bookmark this page and share it with classmates who are preparing for the same exam.
Related notes: 2. SOURCES OF DRUGS – PLANT, ANIMAL, MICROBIAL AND MARINE, 3. HISTORICAL MILESTONES IN DRUG DISCOVERY.
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