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The treatment of pediatric patients with drugs in hospitals is being impeded by a shortage in the availability of licensed drugs in an appropriate formulation. We have studied the extent of use of drugs that are not licensed for use in children (unlicensed) and drugs that are used outside the terms of the product license (off-label). We conducted this study in a Dutch academic children's hospital.

In a prospective study of 5 weeks' duration, we reviewed drug prescriptions in a pediatric ward and 3 intensive care units. We classified the prescribed drugs in 3 main categories—licensed, unlicensed, and off-label—and determined the nature of their unlicensed and off-label use.

Two thousand one hundred thirty-nine courses of drugs were administered to 237 patients in 442 patient-days. Of 2139 prescriptions, 725 (34%) were licensed, 1024 (48%) were unlicensed, and 390 (18%) were off-label. In …