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Matt, only 5% of serotonin is in the brain. The other 95% is in the gut. That's why antidepressants can affect IBS. Remeron is similar to Lotronex in that it works on the same receptors. I find that SSRI antidepressants cause GI problems for me - pain and diarrhoea. Remeron is the opposite - it helps with my IBS. Constipation is a side effect of Remeron so may not be suitable for constipation predominant IBS sufferers. Sorry I don't have any technical info for you. Maybe others will.
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