an agonist which does not activate the receptor fully
an agonist which is unable to induce maximal activation of a receptor population, regardless of the amount of drug applied (See also Intrinsic activity )
an agonist whose maximum effect is less than the maximal response of which the tissue is capable
a compound which possesses affinity for a receptor, but unlike a full agonist, will elicit only a small degree of the pharmacological response peculiar to the nature of the receptor involved, even if a high proportion of receptors are occupied by the compound.
Molecule that activates a cell receptor, but does not cause as much of a physiological change as does a full agonist
An agonist which partially activates a given receptor; may behave as an antagonist in the presence of enough neurotransmitter.