Abstract
The effect of the aqueous extract of Retama raetam (RR) on blood glucose levels was investigated in fasting normal and streptozotocin-induced diabetic rats after single and repeated oral administration. The aqueous extract of RR at a dose of 20 mg/kg significantly reduced the blood glucose in normal rats 6 h after a single oral administration ( P<0.005) and two weeks after repeated oral administration ( P<0.05). This hypoglycaemic effect is more pronounced in streptozotocin (STZ) diabetic rats ( P<0.001). The aqueous extract of RR had no effect on basal plasma insulin levels indicating that the underlying mechanism of RR activity is extra-pancreatic. These findings suggest that the aqueous extract of RR possess significant hypoglycaemic effect in both normal and STZ diabetic rats.
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