Morphine doesn't irritate the stomach. Those things are written for the layman.
Morphine has an isomer called apomorphine. The receptors for that cause nausea/vomiting.
This article describes the area of the brain that the nausea receptors are located in.
http://docs.google.com/viewer?a=v&q=...do8bowR4rNZ1TQ
Quote:
2. Nausea is a common problem that limits opiate use. Mediated by receptors in the area postrena.
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Weezie looking at petunias 8.25.2017
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