Pharmacology
study of substances that interact with living systems through chemical processes
Medical pharmacology
division of science involving using substances to prevent, diagnose, and/or treat disease
Toxicology
study of adverse effects of substances on living systems
Drug
a substance that affects a biological system in a potentially useful way
Poison
any substance capable of producing a harmful effect
Toxin
a naturally - occurring poison
Toxicant
synthetic poison
receptor
the component of a cell or organism that interacts with a drug and leads to the observed effects
regulatory receptor
type of drug receptor responsible for mediating the action of endogenous chemical signals
enzyme receptors
type of drug receptor that mediates chemical reactions/structural conversions
transport receptors
type of drug receptor that moves things, often across membranes
structural receptors
type of drug receptor that provides tissue or cellular structure
positive allosteric modulator
ligand that binds outside the orthosteric site and subsequently increases the affinity of an agonist for that receptor
negative allosteric modulator
ligand that binds outside the orthosteric site and subsequently decreases the affinity of an agonist for that receptor
efficacy
measure of the maximal effect produced by a drug-receptor interaction at plateau
Emax
descriptor of efficacy (measure of max effect produced at plateau)
EC50
concentration of drug required to produce an effect of a given intensity (eg EC50)
Affinity
measure of the strength and probability that a drug will bind an available receptor
Kd
equilibrium dissociation constant - concentration of drug where 1/2 receptors are occupied
Bmax
maximal amount of receptors bound by a drug at plateau
Coupling
process tying drug binding to the end effect observed
quantal dosing
all or none response used to indicate efficacious doses
therapeutic index
measure or the ratio between a toxic and efficacious doses
nuclear receptor
intracellular receptors that regulate gene transcription after activation by a lipid-soluble agonist
Cytokine receptor
transmembrane protein with an extracellular ligand binding domain and an intracellular domain that does not have intrinsic kinase activity, but interacts with kinases