Pharma & drug development · Reference
What is pharmacology?
Pharmacology is the science of how drugs interact with biological systems. It has two main branches: pharmacokinetics, which describes what the body does to a drug, and pharmacodynamics, which describes what the drug does to the body.
The two halves of pharmacology
Pharmacology is best understood through its two complementary branches. Pharmacokinetics follows the journey of a drug through the body — how it is absorbed, distributed to tissues, metabolised and excreted, summarised by the acronym ADME. Pharmacodynamics looks the other way: how the drug acts on its targets to produce an effect, including concepts such as receptors, agonists and antagonists, and the relationship between dose and response. Together they answer the central pharmacological questions of how much drug reaches its site of action and what it does once there.
Why pharmacology matters in development
Pharmacological understanding underpins drug development. During discovery and preclinical work, scientists characterise a candidate’s pharmacokinetics and pharmacodynamics to predict how it will behave in people, and to design the studies that test it. Bioavailability, half-life, potency and the dose–response relationship all derive from pharmacology, and they shape decisions about whether and how a candidate proceeds. This is conceptual, mechanistic science — it explains how drugs work in principle, and is not guidance on how any individual should use a medicine.
Branches and related fields
Pharmacology connects to several neighbouring disciplines. Toxicology studies the harmful effects of substances and shares many methods with pharmacology. Clinical pharmacology applies these principles in human studies, and pharmacovigilance monitors drug effects once a medicine is widely used. Understanding pharmacology is therefore foundational across the pipeline, from the bench science of drug discovery through to post-approval safety surveillance, providing the shared vocabulary for describing how medicines behave.
Key facts
At a glance
- Definition: Science of how drugs interact with living systems
- Branch 1: Pharmacokinetics — what the body does to a drug
- Branch 2: Pharmacodynamics — what the drug does to the body
- ADME: Absorption, distribution, metabolism, excretion
- Key concepts: Receptors, dose–response, potency, half-life
- Related to: Toxicology and clinical pharmacology
Common questions
FAQ
What is pharmacology?+
Pharmacology is the science of how drugs and chemicals interact with living systems, split into pharmacokinetics (what the body does to a drug) and pharmacodynamics (what the drug does to the body). It is an educational, mechanistic field and not personal medical or dosing advice.
What is the difference between pharmacokinetics and pharmacodynamics?+
Pharmacokinetics describes how the body absorbs, distributes, metabolises and excretes a drug, while pharmacodynamics describes how the drug acts on its targets to produce effects. One tracks the drug’s journey; the other tracks its action.
How is pharmacology different from toxicology?+
Pharmacology studies how drugs produce their intended and unintended effects across all dose ranges, whereas toxicology focuses specifically on the adverse or harmful effects of substances. They overlap heavily and share many methods.
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