Abstract

The Product Licence Number given at the end of every data sheet is more useful than is generally recognised. It says something important about the drug and about the value of its data sheet, because it indicates whether the product has been fully assessed by the Licensing Authority and the Committee on Safety of Medicines or whether it merely has a “Licence of Right” (PLR), issued because it was already on the market when the CSM began to issue licences in 1971.