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Mechanism of Action of Anticholinergic Drugs

MOA of Anticholinergic Drugs

Introduction Anticholinergic drugs, also known as parasympatholytic agents, inhibit the actions of the neurotransmitter acetylcholine (ACh) at muscarinic receptors in the central and peripheral nervous systems. Mechanism of Action of Anticholinergic Drugs involves competitive antagonism of acetylcholine at muscarinic (M1–M5) receptor sites, thereby reducing parasympathetic activity. These drugs are used to treat disorders such as … Read more

Mechanism of Action of Antibiotics

MOA of Antibiotics

Introduction Antibiotics are chemotherapeutic agents used to kill or inhibit bacterial growth by targeting essential microbial functions that differ from those in human cells. Mechanism of Action of Antibiotics involves interference with bacterial cell wall synthesis, protein translation, DNA or RNA replication, metabolic pathways, or membrane integrity. These mechanisms ensure selective toxicity—destroying bacterial cells while … Read more

Mechanism of Action of Antibacterial Drugs

MOA of Antibacterial Drugs

Introduction Antibacterial drugs, commonly called antibiotics, are agents that kill or inhibit the growth of bacteria by targeting essential cellular processes unique to prokaryotic organisms. Mechanism of Action of Antibacterial Drugs revolves around interference with cell wall synthesis, protein synthesis, nucleic acid replication, metabolic pathways, or cell membrane integrity. Understanding these mechanisms is essential for … Read more

Mechanism of Action of Antacids

MOA of Antacids

Introduction Antacids are weakly basic compounds that neutralize excess gastric acid in the stomach, providing rapid relief from heartburn, acid reflux, gastritis, and peptic ulcer disease. Mechanism of Action of Antacids involves a direct chemical reaction with hydrochloric acid (HCl) in gastric juice to form salt and water, thereby increasing gastric pH and reducing acidity. … Read more

Mechanism of Action of Amitriptyline

MOA of Amitriptyline

Introduction Amitriptyline is a tricyclic antidepressant (TCA) primarily used in the management of major depressive disorder, neuropathic pain, migraine prophylaxis, and insomnia. Mechanism of Action of Amitriptyline involves inhibition of serotonin (5-HT) and norepinephrine (NE) reuptake at presynaptic nerve terminals, thereby increasing their synaptic concentrations. Additionally, it exhibits significant anticholinergic, antihistaminic, and alpha-adrenergic blocking effects, … Read more

Mechanism of Action of Amiloride

MOA of Amiloride

Introduction Amiloride is a potassium-sparing diuretic that acts on the distal nephron of the kidney to promote sodium excretion while conserving potassium. Mechanism of Action of Amiloride involves direct inhibition of epithelial sodium channels (ENaC) in the late distal tubule and collecting duct, leading to decreased sodium reabsorption and reduced potassium excretion. Unlike aldosterone antagonists … Read more

Mechanism of Action of Amikacin

MOA of Amikacin

Introduction Amikacin is a broad-spectrum aminoglycoside antibiotic primarily used to treat severe Gram-negative bacterial infections, including those resistant to other aminoglycosides. Mechanism of Action of Amikacin involves irreversible inhibition of bacterial protein synthesis by binding to the 30S ribosomal subunit, leading to misreading of mRNA and defective protein formation. Because of its stability against many … Read more

Mechanism of Action of Ambroxol

MOA of Ambroxol

Introduction Ambroxol is a mucolytic and expectorant agent widely used in the treatment of respiratory tract disorders associated with excessive or viscous mucus, such as bronchitis, COPD, and asthma. Mechanism of Action of Ambroxol involves enhancing mucus clearance, stimulating surfactant production, and improving mucociliary transport. It not only facilitates expectoration but also exerts anti-inflammatory and … Read more

Mechanism of Action of Alprazolam

MOA of Alprazolam

Introduction Alprazolam is a short-acting benzodiazepine widely prescribed for anxiety disorders, panic attacks, and generalized anxiety disorder (GAD). Mechanism of Action of Alprazolam involves potentiation of the inhibitory neurotransmitter gamma-aminobutyric acid (GABA) at the GABA-A receptor, resulting in sedation, anxiolysis, and muscle relaxation. Known by its common brand name Xanax, alprazolam has a rapid onset … Read more

Mechanism of Action of Alpha-Adrenergic Blockers

MOA of Alpha-Adrenergic Blockers

Introduction Alpha-adrenergic blockers, also called alpha-blockers, are a class of drugs that antagonize the effects of catecholamines (epinephrine and norepinephrine) at alpha-adrenergic receptors. Mechanism of Action of Alpha-Adrenergic Blockers involves inhibition of alpha-1 and/or alpha-2 receptors, resulting in vasodilation, decreased peripheral vascular resistance, and reduced blood pressure. These drugs are commonly used in the management … Read more

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