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Drug
Any chemical that can affect living processes.
Pharmacology
The study of drugs and their interactions with living systems.
Clinical pharmacology
The study of drugs in humans.
Therapeutics
Also known as pharmacotherapeutics, the use of drugs to diagnose, prevent, or treat disease or to prevent pregnancy.
Selective drug
One that elicits only the response for which it is given.
Safe Drug
one that cannot produce harmful effects—even if administered in very high doses and for a very long time.
Pharmacodynamics
It can be thought of as the impact of drugs on the body.