[Duration of the hypoglycemic action of Opuntia streptacantha Lem].

To assess the duration of Opuntia streptacantha Lem. hypoglycemic effect, two tests in fasting conditions, one with the intake of 500 g of broiled Opuntia stems and the other one with 400 ml of water as control, were performed in eight type II diabetics. Serum glucose levels were measured hourly during six hours. In the Opuntia test the decrease of serum glucose levels was more pronounced at the fourth hour (P less than 0.01 vs control test), serum glucose levels remained unchanged the following two hours. No significant changes on glycemia occurred in the control test. Difference between both tests was significant from the second to the sixth hour.