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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.