
All narcotics have anti-tussive properties. Codeine is actually converted to an active metabolite-- morphine-- which accounts for most of the action of codeine; that is why some people (who have low activity of the cytochrome enzyme G6PD) don't obtain much relief from pain from codeine.
There are cough preparations that contain other opiates-- even dilaudid, which is quite potent. When I was an anesthesiologist, I used the anti-tussive properties of narcotics frequently, for example to prevent 'bucking' on the endotracheal tube at the end of a case. A narcotic-based anesthetic generally has a smooth emergence, as the patient awakes, and opens his/her eyes, calmly-- even while the ET tube is still in place. For such cases I would trickly in small doses of fentanyl to prevent coughing. But they all work!
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Posted by Ether