There are various ways to categorised opioids. Some group opioids by the type of receptors they effect (e.g. mu-opioid receptors) or by...

The Oxford English Dictionary (OED) defines an opioid as "any synthetic narcotic drug derived from or having properties similar to those...

Our methods for developing the Oxford Catalogue of Opioids have been published in the British Journal of Clinical Pharmacology (BJCP) as...

Opioids are one of the oldest and most widely used drug. In many high income countries, their use has increased (Curtis et al. 2019),...