Sammanfattning
Opioids, benzodiazepines and Z drugs are important and widely used drugs, but are associated with a risk of misuse, abuse and adverse effects.
In some situations, serum concentration measurement may be useful to optimise treatment and detect misuse. In this article we show how such
measurements can best be used, and present new reference ranges for these substances in serum, devised by the Norwegian Association of Clinical
Pharmacology.