Long-term treatment of hypertension with labetalol.

1 Thirty-two hypertensive patients have been treated with labetalol for periods of up to 7 years. 2 Ten patients observed for 6 years from time of stabilization of dosage, did not show any tolerance to labetalol. 3 Postural and exercise hypotension were not seen in these patients over this prolonged follow-up, although they were seen in other patients given over 2 g labetalol daily.