Nifedipine and Enalapril vs Nifedipine and Labetalol for the Treatment of Postpartum Hypertension Study

Inclusion Criteria: * Postpartum women aged 18 years or older * Clinical diagnosis of hypertensive disorder in pregnancy (gestational hypertension, chronic hypertension, preeclampsia with or without severe features) * Taking Nifedipine 60 mg every 12 hours for blood pressure control * Persistently elevated blood pressure at/above 140/90 mmHg in a 24-hour time period or have one or more severe range blood pressure at/above 160/110 mmHg requiring a second antihypertensive medication * English speaking Exclusion Criteria: * Taking ≥2 antihypertensive agents during pregnancy * Heart block * Heart rate \<60 or \>120 beats per minute * Heart failure * Creatinine \>1.5 mg/dL * Renal artery stenosis * Active connective tissue disease * Cerebrovascular accident * Failed treatment or contraindications to nifedipine, enalapril or labetalol