Adult Severe HTN Bolus inj: 50 mg IV over at least 1 min, repeat at 5 min intervals if needed. Max: 200 mg. IV infusion: 1 mg/mL soln ie 200 mg diluted w/ 200 mL NaCl & dextrose or 5% dextrose. Severe HTN of pregnancy Infuse at 20 mg/hr, double every 30 min until satisfactory response is obtained or a dose of 160 mg/hr is reached. HTN due to other causes Infuse at 2 mg/min until satisfactory response is obtained.