Calculates IV hydralazine dosing for severe hypertension in pregnancy (preeclampsia/eclampsia). Dose: 5–10 mg IV over 2 minutes; repeat every 20–30 minutes as needed; maximum 20–30 mg per episode. Onset 10–20 minutes; duration 3–8 hours. Monitor fetal heart rate. Many centers now prefer IV labetalol or nicardipine due to hydralazine's unpredictable response.
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