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The opioid drugs include [[#Morphine|morphine]] and its synthetic derivatives. They are powerful '''analgesics''', and have dose-dependent '''sedative''' properties.
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:
Opioids have additional recognised effects. They:
* Decrease the sensitivity of the respiratory centres of the brain to carbon dioxide.
* Decrease the sensitivity of the respiratory centres of the brain to carbon dioxide.
* Give potent cough suppression.
* Give potent cough suppression.