People who cannot tolerate SSRI type drugs, usually have an abundance of serotonin in the body. The drugs raise serotonin in the GI tract and other places and this is the reason for the side effects. Nausea and diarrhea are typical. About 90% of SSRI and SNRI drug effects occur in the body itself. Very little actually crosses the blood brain barrier to the brain. This is why there can be a delay in onset for depression, etc.
Serotonin is the main neurotransmitter in gut. There is an excellent book called the Second Brain, that explains it.
http://www.amazon.com/The-Second-Bra.../dp/0060930721
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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