In its entirety, pharmacology embraces the knowledge of the
history, source, physical and chemical properties,
compounding, biochemical and physiological effects, mechanisms of action,
absorption, distribution, biotransformation and
excretion, and therapeutic and other uses of drugs. Since a drug is broadly
defined as any chemical agent that affects living
processes, the subject of pharmacology is obviously quite extensive.
For the physician and the medical student, however, the scope of pharmacology
is less expansive than indicated by the
above definitions. The clinician is interested primarily in drugs that are
useful in the prevention, diagnosis, and treatment
of human disease, or in the prevention of pregnancy. His study of the
pharmacology of these drugs can be reasonably limited
to those aspects that provide the basis for their rational clinical use.