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Twenty adult Indian patients suffering from the spastic form of irritable colon, i.e. abdominal pain and constipation, were given trimebutine (Mebutin), 2-phenyl, 2-dimethylamino-n-butyl 3, 4, 5-trimethoxybenzoate. Patients were given treatment with 200 mg trimebutine three times daily, or placebo for 4 weeks, and then crossed over. In addition, stool transit times were assessed by the single stool transit time (SST) method of Cummings. Results showed a statistical improvement in abdominal pain and constipation with both trimebutine and placebo after 4 weeks, but only with trimebutine after 8 weeks. Single stool transit time was significantly reduced after trimebutine.
Moshal et al. (1979) studied this question.