Increasing patient knowledge of drug therapy is said to improve compli
ance and may reduce adverse drug reactions. We assessed patient knowle
dge of prescribed drugs in fifty patients attending a hypertension cli
nic [outpatients] and in elderly patients on admission to (n=129) and
on discharge from (n=100) an acute geriatric assessment unit, We found
that 88% of outpatients, 40% of elderly admissions, and 41% of elderl
y discharges knew the indications for their therapy; only 40% of outpa
tients, 8% of elderly admissions and 12% of elderly discharges could n
ame their medications. Patients said that their information came princ
ipally from the prescribing doctor, In a further study we assessed doc
tor, nurse, young and elderly patients' ability to discriminate betwee
n commonly prescribed white tablets. Errors were made by the doctors o
n 25% occasions, nurses on 40% occasions and patients on 61% occasions
, Young patients made errors 67% of the time and elderly patients 55%
of the time. These studies indicate that both inpatients and outpatien
ts, both young and elderly have poor knowledge of their medications. I
n addition, many commonly prescribed drugs are not easily distinguisha
ble by patient, prescriber or drug administrator. We conclude that the
re is a need to improve knowledge both in patients and in prescribers.
We suggest that prescribers should consider the colour and shape of m
edications prescribed concurrently as many ''little white tablets'' ar
e difficult to tell apart.