Structural Formulas of Hydralazine and Isoniazid ... Within 24 hours after a single dose of pyridoxine (25 mg. ), dramatic improvement had occurred, and within 48 hours she was asymptomatic.
[72] During labor and delivery, the most commonly used antihypertensive agents are i.v. hydralazine hydrochloride (5-10 mg every 15-20 minutes until desired response) and i.v. labetalol ...