This article describes and analyzes decision-making by patients, physi
cians, and drug information providers about registered medical drugs.
Based on a cognitive psychology perspective, cognitive variables (the
individual's mediating system) are assumed to be critical factors dete
rmining both patient and physician behavior. The individual's psycholo
gical functioning is seen as a continuous reciprocal interaction betwe
en behavioral, cognitive, and environmental influences; i.e., an inter
actional paradigm is applied. The importance of research models includ
ing cognitive and situation variables to guide the search for appropri
ate research methods is stressed. An intensive research strategy with
a small sample of respondents will often be necessary. Also, responden
ts should be asked to describe their reactions to specific medical sit
uations. The drug information sender has to select a set of goals for
disseminating information to patients. Among the goals most often sele
cted are: message comprehension, receiver satisfaction, changes in kno
wledge, attitudes, and drug behavior, as well as health effects. More
re search is needed on how the patient's mediating system, the actual
situation, and the perceived situation steer his search for and use of
new drug information. A different set of factors influence the patien
t's decision to start a medicinal or drug treatment than the factors t
hat influence his decision to continue a treatment. The latter factors
include forgetfulness, misunderstandings, and the patient's interpret
ation of physiological signs. More cognitive-oriented research about d
rug compliance must be undertaken. In such studies the mediating syste
ms of a group of patients could be considered before and after interve
ntion. There are a great number of types of inappropriate (irrational)
prescribing. However, a physician may prescribe rationally in one are
a but irrationally in another. Face-to-face education of physicians ha
s been shown to be effective in reducing inappropriate prescribing in
a number of studies. ''Overprescribing'' of benzodiazepine has been an
issue of intensive professional debate during the last decades. The t
wo groups who criticize and defend the existing use of benzodiazepines
build their views on different assumptions about the interaction betw
een mind and brain as well as making different value assumptions regar
ding the use of a psychotropic drug. There is a need for prescription
studies where a cognitive and interactional perspective is combined wi
th an information-processing and a normative perspective. The benzodia
zepines dependency problem has provoked lively discussion among profes
sionals and the general public. Long-term benzodiazepine use and perso
nality disorders increase the risk of the patient becoming dependent.
A great number of research models have been suggested for the analysis
of prescription drug dependency and as guides to the treatment of dep
endency. A great need exists for detailed studies of the cognitive and
interactional processes of how benzodiazepine users start, continue,
detect dependency, and eventually stop taking the drug.