Central Nervous System (CNS)
The brain's own pharmacology — sedatives, antidepressants, antipsychotics, opioids, anaesthetics and more.
Foundations
The brain's chemical messengers and the barrier that guards it — the basis of every CNS drug.
Sedatives & Anxiolytics
The GABA system and its drugs — benzodiazepines, barbiturates, and the modern sleeping pills.
Antiepileptics
How seizures start and the drugs that stop them — from phenytoin to status epilepticus.
Antidepressants & Mood
The monoamine story — SSRIs, SNRIs, TCAs, MAOIs, and the mood stabilizers of bipolar disorder.
Antipsychotics
Dopamine, schizophrenia, and the typical vs atypical antipsychotics — with their tell-tale side effects.
Neurodegenerative
Parkinson's and Alzheimer's — restoring dopamine and boosting acetylcholine in the failing brain.
Analgesia & Anaesthesia
Turning off pain and consciousness — opioids, general anaesthetics, and local anaesthetics.
Stimulants & ADHD
Waking up the brain — caffeine, amphetamines, methylphenidate, and the treatment of ADHD.
The Brain's Chemical Messengers: Excitatory vs Inhibitory
Your brain is a storm of eighty billion neurons, every one constantly shouting 'go!' or whispering 'stop.' Health is the balance between those two forces — and nearly every drug that touches the mind works by tipping it. Tip too far toward 'go' and you get a seizure; too far toward 'stop' and you get coma. Learn the handful of chemicals that run this balance, and the whole of brain pharmacology opens up.
The Blood–Brain Barrier: How Drugs Reach the Brain
A patient with Parkinson's disease is missing dopamine in the brain — so why can't we just give them dopamine? Because the brain is guarded by the most selective wall in the body, and dopamine can't get past it. The clever workaround — smuggling in a disguised precursor that becomes dopamine only after it's inside — is one of pharmacology's most elegant tricks, and it's built entirely on understanding the blood–brain barrier.
GABA & Benzodiazepines: Calming the Anxious Brain
A racing heart, a tightening chest, a mind convinced it's about to die — a panic attack feels unstoppable. Yet one small tablet can dissolve it within twenty minutes. How? Benzodiazepines don't add calm from nowhere; they turn up the volume on the brain's own master 'stop' signal, GABA. Understanding that one trick explains how they melt anxiety, halt seizures, and tame alcohol withdrawal — and why they can also become a trap.
Barbiturates, Z-drugs & Other Sedative-Hypnotics
For half a century, barbiturates were the world's sleeping pills — until they became one of its most common ways to die, by accident and on purpose. Why did an entire drug class get pushed aside, and what safer pills replaced it? The answer is a single, deadly difference in how a molecule opens one channel — and it's the clearest lesson in drug safety you'll ever learn.
Antiepileptics Part 1: Silencing the Electrical Storm
A seizure is an electrical storm — millions of neurons firing together in a runaway chain reaction that convulses the body. Anti-seizure drugs are storm-breakers, and they work in only three basic ways: dampen the 'go' signal, boost the 'stop' signal, or steady the wires themselves. Learn those three strategies and the classic drugs fall into place — along with why one wrong choice can make certain seizures worse.
