What is the max dose of labetalol given to a pregnant women with hypertension
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ACOG acute severe hypertension pregnancy labetalol maximum dose IV oral dosage
The maximum depends on route and clinical setting:
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Oral labetalol for chronic hypertension in pregnancy: 2,400 mg/day, usually divided into 2 or 3 doses. A common regimen starts at 100-200 mg twice daily and is titrated. ACOG guidance summary
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IV labetalol for acute severe hypertension (persistent BP at least 160 systolic or 110 diastolic): maximum cumulative 300 mg. Typical escalation is 20 mg IV, then 40 mg after 10 minutes, then 80 mg after another 10 minutes if still severe. ACOG emergency protocol
Avoid or use an alternative with asthma/bronchospasm, bradycardia, heart block, or decompensated cardiac failure. Acute severe hypertension in pregnancy needs urgent supervised treatment.
What is the IV labetalol dosing protocol for severe hypertension?
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ACOG severe hypertension pregnancy IV labetalol 20 40 80 protocol 300 mg
For acute-onset severe hypertension in pregnancy or postpartum that persists for 15 minutes or more (SBP at least 160 mmHg and/or DBP at least 110 mmHg), a common IV labetalol protocol is:
| Time | Dose |
|---|---|
| 0 min | 20 mg IV slowly over 2 minutes |
| 10 min | Recheck BP. If still severe: 40 mg IV over 2 minutes |
| 20 min | Recheck BP. If still severe: 80 mg IV over 2 minutes |
| Thereafter | Some protocols allow further 80 mg IV doses at 10-minute intervals, up to a cumulative 300 mg |
Monitor BP after each dose, along with pulse, symptoms, maternal status, and fetal status when applicable. Aim to reduce out of the severe range, not to normalize BP abruptly.
If BP remains severe after the protocol or the maximum cumulative dose, use an alternative first-line agent such as IV hydralazine or immediate-release oral nifedipine and escalate obstetric/critical-care support.
Do not give labetalol, or seek specialist direction, with asthma/active bronchospasm, bradycardia, heart block, or decompensated heart failure. The 20-40-80 mg sequence and 300 mg ceiling are reflected in ACOG-based protocols and in Rosen’s Emergency Medicine (Box 173.4).
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