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Antiarrhythmic drugs: Procainamide (Class 1A)

December 28, 2025September 17, 2023 by Pharmacology Mentor

Procainamide is a Class IA antiarrhythmic that blocks fast INaINa channels and prolongs repolarization via its active metabolite N-acetylprocainamide (NAPA), making it useful for acute management of a variety of ventricular and supraventricular tachyarrhythmias when carefully dosed and monitored. Classification and overview Procainamide belongs to the Vaughan Williams Class IA group (with quinidine and disopyramide), characterized by … Read more

Pharmacology of Carbonic Anhydrase Inhibitors

December 28, 2025August 31, 2023 by Pharmacology Mentor

I. Introduction and Class Overview Carbonic anhydrase inhibitors (CAIs) are a class of drugs that reversibly inhibit the enzyme carbonic anhydrase, thereby interfering with HCO₃⁻ (bicarbonate) reabsorption and decreasing hydrogen ion secretion in several tissues. Their major clinical uses are as diuretics, in the management of glaucoma, acute mountain sickness, certain epilepsies, and as adjuncts … Read more

Pharmacology of Osmotic Diuretics

December 28, 2025August 31, 2023 by Pharmacology Mentor

Mechanism of Action: Osmotic diuretics work by increasing the osmolarity of the filtrate in the renal tubules. The glomerulus filters them but does not reabsorb them, creating an osmotic gradient that draws water into the nephron. This results in increased urine output and decreased intracranial and intraocular pressure. Pharmacokinetics: Drug Examples: Clinical Use: Side Effects: … Read more

Pharmacology of Potassium-Sparing Diuretics

December 28, 2025August 31, 2023 by Pharmacology Mentor

Potassium-sparing diuretics are a class of diuretic medications that increase diuresis (urine production) while conserving potassium, contrasting with thiazide and loop diuretics that promote potassium loss. They are used primarily to counteract hypokalemia and as adjuncts in conditions involving excessive fluid retention or aldosterone excess. Classification and Key Agents Class Main Drugs Site of Action … Read more

Pharmacology of Thiazide Diuretics

December 28, 2025August 31, 2023 by Pharmacology Mentor

Thiazide diuretics are cornerstone antihypertensive and mild‑to‑moderate diuretic agents that inhibit the thiazide‑sensitive Na‑Cl cotransporter in the distal convoluted tubule, lowering blood pressure and mobilizing edema with characteristic effects on potassium, sodium, uric acid, calcium, and magnesium handling. Their clinical utility spans first‑line therapy for primary hypertension, adjunctive treatment of edema, prevention of recurrent calcium … Read more

Pharmacology of Loop Diuretics

February 3, 2026August 31, 2023 by Pharmacology Mentor

Introduction Loop diuretics are a cornerstone of therapy in conditions where rapid and potent diuresis (urine output) is required. By inhibiting sodium and chloride reabsorption in the thick ascending limb (TAL) of the loop of Henle, loop diuretics evoke profound excretion of sodium, chloride, and water—often making them the most efficacious diuretic class available. Clinicians rely heavily … Read more

Diuretics and Antidiuretics: A Quick Reference Guide

December 27, 2025August 26, 2023 by Pharmacology Mentor

Introduction Welcome to this all-encompassing guide to Diuretics and Antidiuretics. Whether you’re a healthcare professional, a student, or someone simply interested in pharmacology, this article is designed to help you understand these fascinating drug classes in brief (this is not a detailed overview). Let’s dive right in! What Are Diuretics? Diuretics are a class of … Read more

Angina Pectoris: A Comprehensive Guide

December 27, 2025July 11, 2023 by Pharmacology Mentor

Angina pectoris, commonly known as angina, is a type of chest pain caused by reduced blood flow to the heart. This article provides a detailed exploration of angina pectoris, including its classification, types, pathophysiology, and treatment for individual types. We’ll also incorporate flowcharts to help illustrate these concepts. What is Angina Pectoris? Angina pectoris is … Read more

Treatment of Angina Pectoris: A Comprehensive Guide

October 13, 2025July 11, 2023 by anonymous

Pharmacologic treatment of angina pectoris relies on antianginal agents that improve the myocardial oxygen supply–demand balance for symptom control and on adjunctive therapies tailored to mechanism (obstructive, vasospastic, microvascular), heart rate, blood pressure, and comorbidities under contemporary chronic coronary syndrome guidelines. Core antianginal classes include nitrates, beta-blockers, calcium channel blockers, late sodium current inhibition (ranolazine), … Read more

Ischemic Heart Disease: Causes, signs and treatment options

December 28, 2025July 11, 2023 by anonymous

1. Definition & Epidemiology Ischemic heart disease (IHD)—also called coronary artery disease (CAD)—is defined by impaired blood supply (ischemia) to the myocardium, usually due to narrowing or obstruction of the coronary arteries by atherosclerotic plaque. IHD is the leading cause of morbidity and mortality worldwide, particularly affecting adults over age 40 and those with major cardiovascular … Read more