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The opioid drugs include [[#Morphine|morphine]] and its synthetic derivatives. They are powerful '''analgesics''', and have dose-dependent '''sedative''' properties.
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+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.
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==Mechanism of Action==
==Mechanism of Action==