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Antidiabetic effect of combined aqueous leaf extract of Vernonia amygdalina and metformin in rats

Author(s): U Adikwu Michael, B Uzuegbu David, C Okoye Theophine, F Uzor Philip, Adibe Maxwell Ogochukwu, V Amadi Benson

This study investigated the antidiabetic activity of the various combina-tions (ratios) of metformin (50 mg/kg) and aqueous extracts of the leaves of Vernonia amygdalina (100 mg/kg). The ratios of Extract to Metformin were 1:1, 2 1, and 2:1 and distilled water (control, p.o.) were given to both normoglycemic and alloxan-induced diabetic Wister albino rats. Blood was withdrawn and tested at 0, 1, 3 and 6 hours. Results showed that the combinations of the extract and metformin caused more re-duction in glycemia compared to any of the agents acting alone in either of the two categories of animals. The ratio of 1:2 caused the most significant (p<0.05) reduction in blood sugar (-66.07%) compared to distilled water (-7.2%). However, the ratio of metformin: extract (2:1) caused a reduction of -62.66% but was found a better combi-nation considering the safety of the drugs. The combination of Vernonia amygdalina with metformin for the management of diabetes should be highly encouraged with a reduction in the dose of metformin and an increase in the dose of the plant extract to guarantee efficacy and safety.


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