Webster's New World Medical Dictionary

drug, anti-infective
See 
agent, anti-infective.
drug, antiviral
See 
antiviral agent.
drug, over-the-counter
A drug for which a pre-
scription is not needed.
drug, prescription
See 
prescription drug.
drug, teratogenic
See 
teratogen.
drug activity
A measure of the physiological
response that a drug produces. A less active drug
produces less response, and a more active drug
produces more response.
Drug Enforcement Administration
See 
DEA.
drug resistance
The ability of bacteria and other
microorganisms to withstand a drug that once
stalled them or killed them.
drug screen
An examination of biologic material
to detect the presence of certain drugs and deter-
mine prior drug use. Also known as a drug test.
drug-coated stent
See 
coated stent.
drug-induced
Incited or caused by a drug.
drugs during pregnancy, dangerous
See 
ter-
atogen.
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dry eyes
See 
xerophthalmia.
dry mouth
See 
xerostomia.
dry skin
See 
xeroderma.
DSM-IV
Diagnostic and Statistical Manual of
Mental Disorders, fourth edition, the official source
on definitions related to mental illness.
DT immunization
A vaccination against diph-
theria and tetanus. DT immunization does not pro-
tect from pertussis as the DTP and DTaP
immunizations do. It is usually reserved for individ-
uals who have had a significant adverse reaction to
a DTP shot or who have a personal or family history
of seizure disorder or brain disease. See also 
diph-
theria; tetanus.