This episode explores muscarinic receptor pharmacology as a lesson in nuance. Acetylcholine acting at muscarinic receptors governs secretion, smooth muscle tone, heart rate, and central signalling. We move beyond lists of agonists and antagonists to understand muscarinic effects as context-dependent responses shaped by receptor subtype, tissue distribut…

This episode lays the physiological foundation for all of neuropharmacology by exploring how neurons communicate with each other and with effector organs. Rather than starting with drug classes, we begin with the architecture of signalling itself: synapses, neurotransmitters, receptors, and termination mechanisms. Autonomic and somatic systems are contr…

This episode explores how genetics influences the way individuals handle and respond to medicines. Pharmacogenetics is framed not as a futuristic add-on, but as an extension of everyday pharmacology—explaining why standard doses fail some patients, harm others, and work beautifully for a few. We focus on principles that clinicians can recognise and appl…

This episode looks at what happens when a drug meets the body’s chemical processing plants. Drug metabolism is framed not as simple breakdown, but as biotransformation—a set of enzymatic decisions that can inactivate drugs, activate pro-drugs, generate toxic intermediates, or change duration of action. We explore why metabolism is central to variability…

This episode explores a layer of pharmacology that quietly shapes almost every therapeutic decision but is often overlooked: membrane transporters. These proteins act as biological customs officers, controlling drug entry, distribution, and elimination at the cellular level. We examine how transporters influence variability in drug response, underpin ma…

This episode examines the shadow side of pharmacology—how drugs cause harm, why toxicity is often dose- and context-dependent, and how clinicians reason through poisoned states. Rather than treating toxicity as an exception, we frame it as an extension of pharmacology itself: the same principles of kinetics and dynamics, pushed beyond safe margins or di…

This episode shifts the lens from movement to mechanism. Pharmacodynamics explores how drugs interact with biological targets to produce effects—therapeutic and adverse. Rather than memorising receptor lists, we build a conceptual framework for understanding why drugs behave the way they do, and how small molecular differences translate into large clini…

This episode follows a drug’s journey after it enters the body, focusing on the forces that determine how much, how fast, and for how long a medicine exerts its effect. Pharmacokinetics is presented as a story of movement and timing—where absorption, distribution, metabolism, and elimination together shape exposure, response, and safety. We connect equa…

In this opening episode, we set the stage for the whole series by tracing the life-cycle of a drug: why it is pursued, how it is discovered, how it is tested, and what it takes to make it safely and ethically available to the public. We treat pharmacology as both a science and a social contract—where benefit must be proven, harm anticipated, and uncerta…

Every metabolic reaction produces acid. Without precise correction, this chemical drift would quietly disrupt enzymes, membranes, and electrical signalling. The kidneys provide the final safeguard—adjusting what the lungs cannot.

In this concluding episode, Medlock Holmes examines how the kidneys regulate acid–base balance through hydrogen ion secretion,…