Natural Product Pharmacology
Natural product pharmacology is the study of how compounds derived from plants, fungi, microorganisms, and other biological sources act on living systems. Sitting at the interface of pharmacognosy and pharmacology, it asks how a natural compound is absorbed, distributed, metabolized, and eliminated (its pharmacokinetics), and what it does to the body once present (its pharmacodynamics), including the molecular targets it engages and the interactions it has with conventional medicines.
Definition
Natural product pharmacology is the branch of pharmacology concerned with the absorption, distribution, metabolism, excretion, mechanisms of action, and interactions of chemically defined or partially defined substances obtained from natural sources.
Scope
This area orients the reader to the pharmacological behaviour of natural products as a class. It frames the topic nodes beneath it — the pharmacokinetics of herbal compounds, the pharmacodynamics of plant metabolites, drug-receptor interactions, herb-drug interactions, and bioavailability and metabolism. It treats natural products as objects of pharmacological inquiry and method, not as recommended therapies, and does not provide dosing or individualized treatment guidance.
Sub-topics
Core questions
- How do the physicochemical properties of natural products shape their absorption, distribution, metabolism, and elimination?
- Through which molecular targets and mechanisms do plant and microbial metabolites exert effects?
- Why do many natural products show low oral bioavailability, and what governs it?
- How do constituents of a multi-component extract interact with each other and with co-administered drugs?
Key concepts
- Pharmacokinetics and pharmacodynamics of natural products
- Low and variable oral bioavailability
- Phase I and phase II metabolism of plant constituents
- Drug-metabolizing enzyme and transporter modulation
- Multi-component synergy and polypharmacology
- Herb-drug interactions
- Structure-activity and drug-likeness considerations
Mechanisms
Natural products span an unusually wide chemical space, from small lipophilic terpenoids to large, polar glycosides and polyphenols. This diversity drives their pharmacological behaviour: many engage defined receptors, enzymes, ion channels, or transporters, while others act on several targets at once, a feature captured by network and polypharmacology thinking (Hopkins, 2008). Because plant materials are typically administered as mixtures, constituents may act additively, synergistically, or antagonistically, and minor compounds can alter the absorption or metabolism of major ones (Williamson, 2001). The same metabolic and transport systems that handle conventional drugs also process natural products, which is why this area connects pharmacokinetics, pharmacodynamics, and interaction phenomena into one framework.
Clinical relevance
Natural products and their derivatives account for a substantial share of approved medicines, and herbal preparations are widely used alongside conventional drugs (Newman & Cragg, 2016; Atanasov et al., 2021). Understanding their pharmacology underpins evidence appraisal, the anticipation of herb-drug interactions, and the interpretation of efficacy and safety signals. This entry describes how such evidence is generated and reasoned about; it is reference material and not a basis for individual diagnostic or treatment decisions.
History
The pharmacology of natural products grew out of classical pharmacognosy, which catalogued medicinal plants and their constituents, and matured as analytical chemistry and molecular pharmacology allowed individual compounds to be isolated and their actions characterized. Surveys of new drug approvals have repeatedly shown that natural products and their structural derivatives remain a major source of therapeutic agents (Newman & Cragg, 2016), and contemporary reviews frame the field around modern target identification, multi-component analysis, and renewed interest after a period of decline (Atanasov et al., 2021).
Key figures
- David J. Newman
- Gordon M. Cragg
- Elizabeth M. Williamson
- Andrew L. Hopkins
- Atanas G. Atanasov
Related topics
Seminal works
- newman-cragg-2016
- atanasov-2021
- williamson-2001
- hopkins-2008
Frequently asked questions
- How is natural product pharmacology different from conventional pharmacology?
- It applies the same pharmacokinetic and pharmacodynamic principles, but to substances from natural sources that are often administered as complex mixtures, frequently show low or variable bioavailability, and may act on multiple targets at once.
- Are natural products a meaningful source of medicines?
- Yes. Reviews of approved drugs show that natural products and their derivatives account for a large fraction of therapeutic agents, particularly among anti-infectives and anticancer drugs.