Update information

Update information

September 2019: This topic was retained for the 2019 rapid update of medicines optimisation: key therapeutic topics. Minor editorial changes have been completed. In addition, information on the reclassification of pregabalin and gabapentin has been updated, a link to a NICE guideline in development has been added, a Medicines and Healthcare products Regulatory Agency (MHRA) safety alert has been added, new resources and shared learning examples have been added, and prescribing data have been updated.