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The opioid drugs include [[#Morphine|morphine]] and its synthetic derivatives. They are powerful '''analgesics''', and have dose-dependent '''sedative''' properties.
Opioids have addtional recognised effects. They:
* Decrease the sensitivity of the respiratory centres of the brain to carbon dioxide.
* Give potent cough suppression.
* Cause emesis.
* Constrict the pupils (miosis).
* Reduce gastro-intestinal motility.
* Lead to histamine release.
==Mechanism of Action==
==Mechanism of Action==