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    Re-evaluating the effi cacy of the aqueous leaf extract of Bridelia ferrugenia and its potential combination with metformin in the management of diabetes mellitus

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    Herbal medicinal products play a significant role in the management of diabetes and other chronic diseaseseither as a monotherapy or in combination with allopathic treatments. The hypoglycemic activity of a Ghanaianherbal antidiabetic product (Bridelia Tea) prepared from the dried leaves of Bridelia ferrugenia [BRD] was reevaluatedin this study with the view of improving, its activity and explore the possible benefit of using theproduct in combination with metformin (MET). Male and female Sprague-Dawley rats (210-220 g) were renderedhyperglycemic by a single intraperitoneal administration of streptozocin (70 mg/kg) after an overnight fast. Thehyperglycemic rats then received one of the following treatments ([BRD 30 mg/kg or 300 mg/kg], [MET 250 mg/kgor 1000 mg/kg], [MET 250 mg/kg and BRD 30 mg/kg], [MET 1000 mg/kg and BRD 300 mg/kg]). The hypoglycemiceffect of BRD, MET, and the combination of the two products were not significantly different during an initial6 h of monitoring (P > 0.05). In the long-term study over 28 days, BRD 300 mg/kg had hypoglycemic effectscomparable to MET 1000 mg/kg p.o. and better than BDF 30 mg/kg p.o. (P < 0.05). However, the combination ofthe two products BRD and MET at the two doses reduced their therapeutic effect compared to animals receivingeither one of the two treatments alone
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