IMPORTANT OBSTRTICS MEDICINES. Group:- Alpha (alpha) and beta (beta) adrenergic antagonist Dose :- 1ml -5mg, 20mg/4ml Route :- intravenously (lv only), ORAL Mode of action :- Labetalol combines both selective competitive alpha one blocking and non-selective beta receptor blocking activity in a single substance. Labeta Lol is a beta blocker medication that relaxes blood vessels and slows the heart rate, decreasing blood flow and blood pressure. Use :- High blood