The effects of the ethanol extract (1.25 g/kg) and fractions (1 g/kg) of Bridelia ndellensis
stem bark on the blood glucose levels in streptozotocin-induced types 1 and 2 diabetic rats at different prandial states were studied. The ethanol extract of B. ndellensis
had no hypoglycemic effect in type 1 diabetic rats in fasting and postprandial glucose load conditions and, in type 2 diabetic rats in fasting condition. However, the extract, and its ethyl acetate and dichloromethane fractions significantly lowered blood glucose levels in type 2 diabetic rats when fed simultaneously with glucose. The active principles responsible for the antihyperglycaemic effect are concentrated in the ethyl acetate and dichloromethane fractions of the extract.