Columbia subject headings:
Drug utilization--Economic aspects--United States.
Drugs--United States--Generic substitution.
Generic drugs--Economic aspects--United States.
Harvard subject headings:
Drug utilization--Economic aspects--United States.
Drugs--United States--Generic substitution.
Generic drugs--Economic aspects--United States.
Princeton subject headings:
Drug utilization--Economic aspects--United States.
Drugs--United States--Generic substitution.
Generic drugs--Economic aspects--United States.