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There are four main kinds of targets for the drugs to bind to:
There are four main kinds of targets for the drugs to bind to:
* '''Receptors''':
* '''Receptors''' - these are protein molecules that are capable of responding to endogenous chemical signals. They are usually found on the cell membrane, in the cytoplasm or on the nucleus and other organelles.
* '''Enzymes''' - both intracellular and extracellular ones.
* '''Ion Channels'''
* '''Transport proteins'''
===Agonists===
An agonist can be defined as '''a drug that binds to a target molecule and results in activation of the receptor and thus a tissue response'''.