Introduction Cardiac arrhythmias—or disturbances in the normal electrical rhythm of the heart—represent a complex spectrum of disorders that can range from benign to life-threatening (Katzung, 2020). In normal physiology, the synchronized contraction of cardiac muscle cells promotes efficient pumping of blood. The timely, sequential electrical activation of the atria and ventricles depends on a finely … Read more
Introduction Pharmacogenetics and pharmacogenomics represent a groundbreaking convergence of genetics, medicine, and pharmaceutical sciences. By investigating the ways individual genetic variations influence drug response, researchers and clinicians have profoundly impacted strategies for optimizing patient outcomes. The concept of personalized medicine—tailoring treatments to individuals based on their genetic makeup—holds the promise of improved therapeutic efficacy and … Read more
Introduction Pharmacokinetics is the branch of pharmacology devoted to understanding what the body does to a drug once it has been administered. This entails a detailed look at four main processes collectively known by the acronym ADME: Absorption, Distribution, Metabolism, and Excretion. Together, these processes determine the onset, intensity, and duration of a drug’s action in the body (Goodman & Gilman, 2018). When a patient takes … Read more
Introduction to Structure-Activity Relationships (SAR) Structure-Activity Relationships (SAR) explore the connection between a compound’s chemical structure and its biological activity. By analyzing how different molecular structures influence biological effects, researchers can predict and optimize the efficacy of organic compounds, playing a crucial role in drug discovery and development. Principles of SAR Quantitative Structure-Activity Relationships (QSAR) … Read more
Introduction Androgens—the primary being testosterone and its potent intracellular metabolite dihydrotestosterone (DHT)—drive the development and maintenance of male phenotype, regulate protein anabolism, affect behavior, and exert complex feed-back control over the hypothalamic–pituitary–gonadal (HPG) axis. Therapeutically, natural and synthetic androgens (collectively “anabolic-androgenic steroids,” AAS) are indispensable in endocrinology, hematology, geriatrics, gynecology, and even palliative care. 1. Chemical Classification Group … Read more
I. Introduction and Historical Context Anti-androgens are a pharmacologically diverse class of agents designed to diminish or block the effects of endogenous androgens—principally testosterone and dihydrotestosterone (DHT)—on target tissues. Since the recognition of androgen dependence in prostate cancer in the 1940s, the development of anti-androgen therapies has revolutionized management of hormone-dependent cancers, benign prostate disease, androgen … Read more
Introduction The autonomic nervous system (ANS) plays a crucial role in regulating various physiological functions in the human body. It consists of two main divisions: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS). These systems work in opposition to each other to maintain homeostasis. The effects of the ANS are mediated through … Read more
Introduction Skeletal muscle relaxants are a diverse group of medications that act on the central nervous system (CNS) or directly on skeletal muscles to reduce muscle tone and alleviate symptoms such as muscle spasms, pain, and hyperreflexia (Katzung & Trevor, 2021). These drugs are commonly used in various clinical settings, including anaesthesia, neurology, and pain … Read more
Introduction The neuromuscular junction (NMJ) is a specialized synapse where a motor neuron communicates with a skeletal muscle fiber to initiate muscle contraction. This communication relies on the release of acetylcholine (ACh) from the presynaptic terminal of the motor neuron, the subsequent binding of ACh to nicotinic receptors on the postsynaptic muscle membrane, and the resultant end-plate potential that triggers muscle contraction. Neuromuscular junction (NMJ) blockers—also referred to … Read more
Introduction Angina pectoris, often referred to simply as angina, is chest pain or discomfort that arises when the myocardial oxygen supply is insufficient to meet the heart’s metabolic demands. As a cardinal manifestation of coronary artery disease (CAD), angina affects millions of people worldwide, posing a significant burden on healthcare systems and patient quality of … Read more