Evaluation of In Vivo Antidiarrheal Activities of 80% Methanol Extract and Solvent Fractions of Peels of Colocasia esculenta (Araceae).

Background: Diarrhea is the common gastrointestinal disorder accounting for 2.5 billion episodes and 1.5 million deaths annually. Limitations and inaccessibility of currently available medications are the main problem associated with treatment of diarrhea. Hence, medicinal plants are usually preferred to manage diarrhea because they may contain constituents with high activity and fewer side effects. Even though the dose, safety, and efficacy of Colocasia esculenta (L.) Schott are not substantiated scientifically, several societies use it for the treatment of diarrhea.

Objective: This study was targeted at exploring the in vivo antidiarrheal activities of 80% methanol extract and solvent fractions of peels of Colocasia esculenta (L.) Schott in Swiss albino mice.

Methods: The plant was collected and extracted with 80% methanol, followed by fractionation with distilled water, chloroform, and diethyl ether. Castor oil-induced diarrhea, enteropooling, and motility tests were used to evaluate antidiarrheal activity. The test groups received graded doses of 100 mg/kg, 200 mg/kg, and 400 mg/kg. Negative controls received 10 ml/kg of 2% Tween 80 while positive controls received loperamide (3 mg/kg) or atropine (5 mg/kg).

Results: The crude and solvent fractions of the plant extract have induced significant effects in reduction of the number and weight of wet stools at all tested doses. However, delay in onset of diarrhea was observed only at 400 mg/kg (P < 0.001) for both crude extract and solvent fractions. In antienteropooling test, 80% methanol extract and solvent fractions have significantly reduced the weight and volume of intestinal contents, especially at 200 mg/kg and 400 mg/kg. Regarding the antimotility test, the crude extract reduced motility at all tested doses, whereas the solvent fractions reduced intestinal motility mainly at 400 mg/kg (P < 0.001).

Conclusion: The study has revealed that the 80% methanol extract and solvent fractions of the plant possess antidiarrheal activities supporting the traditional antidiarrheal claims of the plant.