A significant number of children receive either an unlicensed or an off-label
drug during their stay in hospital. Studies throughout Europe have shown that at least one-third of children in hospital and up to 90% of neonates in a neonatal intensive care unit receive such
drug prescriptions. The medicines that are most frequently used off-label include
analgesics,
antibiotics and
bronchodilators. The purpose of licensing a
drug is to ensure safety, efficacy and quality. If a
drug is used in a different manner, one would expect a greater risk of toxicity. Only three studies have commented on the risk of toxicity in relation to unlicensed or off-label
drug use. Only one of these three studies prospectively tried to evaluate the risk associated with off-label and unlicensed
drug prescription. This study suggested that the percentage of unlicensed and off-label
drug use was significantly associated with the risk of an
adverse drug reaction. Two studies looking at
adverse drug reactions suggest that there is a greater risk of a severe
adverse drug reaction occurring in association with the off-label or unlicensed use of drugs. One study found that five out of eight severe
adverse drug reactions were associated with the
off-label use of a medicine. The other study found that 14 of 19
drug prescriptions associated with 17 severe
adverse drug reactions were either unlicensed or off-label. The risk of
prescribing off-label and unlicensed drugs in children is not clear from the limited data available.