<prompt> Labetalol is anAlpha 1 blockerAlpha 2 blockerAlpha 1 and selective beta 1 blockerAlpha 1 and non-selective beta blocker  <response>: Labetalol is a commonly used a 1 and non-selective b-adrenergic blockerDose: 200-2400mgday, orally in two to three divided dosesIn an emergency: 20mg IV, followed by 20-80mg every 20min to a maximum of 220mg. Avoid in patients with Asthma, congestive cardiac failure, Liver failureRef: Williams Obstetrics; 25th edition 