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Coleus barbatus (Labiatae) Benth is popularly used in Brazil "for the healing of liver and stomach diseases". The water extract (WE 1 to 10 g/kg, p.o.) of stem and leaves given to rats and mice did not induce signs of intoxication. Previous treatment of mice with WE (1 g/kg, p.o.) shortened the sleeping time induced by pentobarbital (50 mg/kg, i.p.) by 37%, although the extract alone did not increase the spontaneous activity nor did it induce hyperexcitability. In mice WE (2 g/kg, p.o.) increased the intestinal transit of charcoal by 30%, while reduced gastric secretions in rats treated with WE (2 g/kg intraduodenal) (3.9 +/- 1.0 to 0.5 +/- 0.2 ml/4 h, respectively). The treatment also reduced the total acid secretion from 34.4 +/- 11.0 to 2.7 +/- 0.5 mEq/l and raised gastric pH from 2.2 +/- 0.3 to 6.5 +/- 0.8. Treatment with WE (2 g/kg, p.o.) protected against gastric ulcers induced by stress (5.3 +/- 1.6 and 1.5 +/- 0.5 ulcers/cm2), but it did not protect against indomethacin induced ulcers. The results show that the water extract of C. barbatus Benth produces mild stimulation of the central nervous system and increases intestinal movements. The extract also reduces gastric secretion indicating an antidyspeptic activity, and protects against gastric ulcers induced by stress.

The water extract of Coleus barbatus Benth decreases gastric secretion in rats