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Adrenergic Neurotransmitters

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Indirect-Acting Sympathomimetics

Various Mixed-Acting Sympathomimetic Drugs

Various Alpha Adrenergic Blockers Drugs

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Various Beta-Adrenergic Blockers Drugs

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Medicinal Chemistry I

Other Subjects of B Pharmacy 4th Semester

Topic wise notes of:

Pharmacology I


Topic wise notes of:

Physical Pharmaceutics II


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Topic wise notes of:

Pharmacognosy & Phytochemistry I


Topic wise notes of:

Pharmaceutical Organic Chemistry III

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Drugs Acting on the Autonomic Nervous System – Summary

Unit II focuses on adrenergic drugs and their interaction with the autonomic nervous system (ANS), particularly the sympathetic division. It begins with the biosynthesis and catabolism of catecholamines, such as dopamine, norepinephrine, and epinephrine, which are vital neurotransmitters regulating cardiovascular and metabolic functions.

The unit explores the adrenergic receptors (alpha and beta) and their distribution across body tissues, which is essential for understanding the action of sympathomimetic and adrenergic antagonist drugs. A significant portion is devoted to sympathomimetic agents, including their structure-activity relationships (SAR) and classification into direct, indirect, and mixed-acting agents.

Direct-acting agents like norepinephrine, epinephrine, phenylephrine, dopamine, and salbutamol act directly on adrenergic receptors to produce therapeutic effects such as bronchodilation and increased heart rate. Indirect-acting agents (e.g., hydroxyamphetamine, pseudoephedrine) enhance neurotransmitter release, while mixed-acting drugs like ephedrine exert both direct and indirect actions.

The unit also covers adrenergic antagonists, including alpha-blockers (e.g., tolazoline, prazosin) and beta-blockers (e.g., propranolol, atenolol, metoprolol), along with their SAR and clinical uses in treating hypertension, arrhythmias, and heart conditions. This comprehensive overview enables a deep understanding of adrenergic pharmacology and its clinical relevance.

At FirstHope, we provide BPharm notes that are topic-wise, easy to understand, and designed strictly as per the AKTU and Other Universities, hence designed according to PCI syllabus.

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