Agonist drugs, which interact with a receptor mimicking
the effect of a natural mediator
Partial agonist drugs, whose maximal response falls
short of the full response
Antagonists block the effect of the natural mediator
at a receptor to prevent an effect
Selective, but not specific, drugs (which act on more than
one receptor and produce side-effects, which lead to dry
mouth, blurred vision, constipation and drowsiness)
Inhibiting enzymes in the body