To assess small intestinal transit, we employed an activated carbon gavage test 17 , which revealed a significant, dose-dependent reduction in the small intestinal transit rate in morphine-treated mice compared to saline-treated controls (Fig
Black or tarry stool, visible blood in the stool, vomiting blood, severe abdominal pain, unexplained weight loss, persistent fever, anemia, or progressive swallowing difficulty should be evaluated appropriately
7 Non-enzymatic antioxidants inhibit reactions involving free radicals

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