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Learn Pharmacology

Learn how drugs move through the body and how they act on it.

Free to start. Built from a single prompt. No credit card.

Pharmacology is the science of how drugs interact with living systems. It has two halves. Pharmacokinetics describes what the body does to a drug: absorption, distribution, metabolism and excretion, often shortened to ADME. Pharmacodynamics describes what the drug does to the body, mostly by binding receptors, enzymes, ion channels or transporters. Once those principles click, drug classes become variations on a theme. Everything here is educational and never a substitute for advice from a doctor or pharmacist. Learnr builds a pharmacology course from your prompt and teaches it as short, adaptive interactive lessons.

How to learn Pharmacology, step by step

Learn ADME as one journey. Follow a single oral tablet from the gut into the blood, through the liver's first-pass metabolism, into tissues, and out through the kidneys. Each stage explains a familiar instruction, such as why some drugs are not given by mouth.
Get comfortable with half-life math. Use the fact that roughly four to five half-lives clear most of a drug, and that repeated dosing approaches steady state over a similar time. Practice with first-order elimination curves on a log scale.
Understand receptors and binding. Learn how agonists activate receptors, antagonists block them and partial agonists do some of each. Then study receptor families, including G protein-coupled receptors, ion channels and enzyme-linked receptors.
Read dose-response curves. Plot response against log dose to get the sigmoid curve, and use EC50 for potency and maximum effect for efficacy. Compare therapeutic index across drugs to see why some need careful blood-level monitoring.
Study drug classes by mechanism. Group drugs by what they target, such as the autonomic nervous system, cholesterol synthesis or bacterial cell walls, rather than memorizing names alone. Drug name suffixes like -olol and -statin help you place them.
Review mechanisms in short daily sessions. Pharmacology involves a lot of names and mechanisms. Brief Learnr sessions with streaks help it stick, and any question about your own medicines should go to a pharmacist or doctor.

What you'll learn

Explain the four stages of pharmacokinetics: absorption, distribution, metabolism and excretion
Use half-life to estimate how long a drug takes to clear or reach steady state
Distinguish agonists, antagonists and partial agonists at a receptor
Read a dose-response curve and compare potency, efficacy and therapeutic index
Describe how major drug classes act, such as beta blockers, statins and antibiotics

What's inside your Pharmacology course

A sample path Learnr builds for Pharmacology. Your real course adapts to your goal and level.

1. Drugs, targets and routes of administration
2. Absorption, bioavailability and distribution
3. Metabolism, cytochrome P450 and excretion
4. Receptors, agonists and antagonists
5. Dose-response, potency, efficacy and safety
6. Major drug classes and how new drugs are tested

How long does it take to learn Pharmacology?

Core principles of pharmacokinetics and pharmacodynamics take about 1 to 2 months at 3 to 5 hours a week. A survey of major drug classes takes another few months. Clinical pharmacology for prescribing is part of professional health training and takes years.

What you need before you start

Basic biology and chemistry, including cells, proteins and enzymes. Physiology and biochemistry make drug targets far easier to understand, and algebra plus logarithms help with kinetics.

Common mistakes to avoid

Treating potency and efficacy as the same thing. A more potent drug works at a lower dose, while a more efficacious one produces a bigger maximum effect.
Memorizing drug names without mechanisms. Learn each class by its target and effect, and individual drugs become easy to slot in.
Applying textbook pharmacology to your own medication decisions. Doses and interactions depend on the individual, so ask a pharmacist or doctor.

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Pharmacology questions, answered

What is the difference between pharmacology and pharmacy?

Pharmacology is the science of how drugs act and move through the body. Pharmacy is the health profession that prepares and dispenses medicines and advises patients, which uses pharmacology as one of its foundations.

Do I need chemistry to learn pharmacology?

Basic chemistry helps, especially ideas like acids, bases and solubility that affect absorption. You do not need advanced organic chemistry for introductory pharmacology, though medicinal chemistry does use it.

Can I use this course to decide which medicine to take?

No. The course is educational and cannot account for your health, other medicines or allergies. Always ask a doctor or pharmacist about your own treatment.