Emergency, respiratory, toxicology and pharmacology learners get a mechanism-first review of the autonomic nervous system. Adrenergic and muscarinic receptors are linked to clinically familiar drugs including salbutamol, beta blockers, clonidine, atropine, ipratropium, tiotropium, neostigmine and donepezil.

Prehospital, emergency and critical-care clinicians get a mechanism-led review of medicines used for analgesia, sedation, seizure control, bradycardia, bronchospasm, shock, haemorrhage and acute coronary syndromes. Receptor and pathway effects are connected to physiological targets, adverse effects, protocol restrictions and structured medication handover.

Prehospital, emergency and toxicology clinicians get a mechanism-led tour of the paramedic drug kit. Adrenaline, antiplatelets, anticoagulants, blood products, calcium, insulin, bronchodilators and antidotes are linked to indications, physiological targets, safety checks and structured handover.

Infectious-diseases, primary-care and basic-science learners get a mechanism-led review of DNA-inhibiting antibiotics. Metronidazole, rifamycins and fluoroquinolones are separated by target, infection site and safety profile, with anaerobic infection, protozoal disease, tuberculosis, urinary infection, respiratory infection, resistance risk, interactions and counselling kept in view.

Emergency, paediatric and physiology learners get a practical explanation of body temperature as a regulated organ-temperature range rather than a fixed number. It links metabolic heat production, hypothalamic control, fever physiology, measurement-site limitations and heat loss through radiation, evaporation, conduction and convection.

A physiology and prescribing refresher for clinicians using hydrocortisone, prednisolone or dexamethasone. HPA-axis regulation, intracellular receptor effects, adrenal suppression, hyperglycaemia, infection, bone risk and safe withdrawal after prolonged systemic treatment are kept together.

Emergency clinicians and students revising acute presentations get toxidrome, neurological and limb-ischaemia cues in one wide-ranging item. Opioid overdose, absent brain stem reflexes, sickle cell pain, electrical injury, traumatic airway difficulty and scurvy are linked to practical reassessment pitfalls.

Raised blood pressure, oedema, reduced urine output or chest pain can be a route into renal and cardiovascular physiology. It links RAAS, eGFR, chronic kidney disease, NSAID risk, diabetic atherosclerosis and ACS symptom patterns without turning the science into isolated facts.

Slow heart rate is the best place to begin because the bedside question is common: physiological bradycardia or pathological bradyarrhythmia? It links dizziness, syncope and confusion with ECG rhythm reading, reversible triggers, sick sinus syndrome, escape rhythms and high-grade atrioventricular block.

The episode links tight junctions, endothelial transport, basement membrane, pericytes, astrocytes and microglia with levodopa use, neuroinflammation, head injury, sepsis, meningitis, encephalitis and multiple sclerosis.