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'''Pharmacodynamics is the actions of drugs on the body.'''

'''Pharmacodynamics is the actions of drugs on the body.'''

For drugs to act upon the body the must be able to exert some chemical influence upon a cell to result in a physiological response. They are capable of doing this by binding to a target molecule (usually proteins).

For drugs to act upon the body they must be able to exert some chemical influence upon a cell to result in a physiological response. They are capable of doing this by binding to a target molecule (usually proteins).

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: