Hydralazine 20 mg injection (Hydralazine Hydrochloride USP 20 mg/mL) is a sterile injectable vasodilator used in clinical settings to manage severe hypertension (high blood pressure) and hypertensive emergencies when rapid and controlled blood pressure reduction is needed, especially when oral therapy is not appropriate or feasible. It directly relaxes smooth muscle in arterioles, reducing systemic vascular resistance and lowering blood pressure.

🧠 Mechanism of Action:

Hydralazine works by directly relaxing the smooth muscle of arterioles, not veins. This reduces peripheral vascular resistance and lowers blood pressure without significant changes in cardiac output at moderate doses. By decreasing systemic vascular resistance, it reduces cardiac afterload, which enhances cardiac output and blood flow — especially useful in severe hypertension and certain forms of heart failure.

💉 Form, Packaging & Administration:

The product is supplied as a clear sterile solution in ampoules or vials containing 20 mg of hydralazine per mL. Administration is via intravenous (IV) or intramuscular (IM) routes by trained healthcare professionals in hospital or clinical environments. Dose and rate are determined based on clinical context, patient age, and response, and should be carefully monitored.

🩺 Primary Clinical Uses:

Acute severe hypertension / hypertensive emergencies

Pre-eclampsia/eclampsia (under obstetric supervision) when rapid blood pressure control is needed

Heart failure (adjunctive therapy in select cases to reduce afterload)

When oral antihypertensive therapy is not possible or ineffective.

⚠️ Important Safety & Precautions:

Hydralazine should only be used under medical supervision due to its potent effects on blood pressure. Side effects can include tachycardia (rapid heartbeat), headache, flushing, nausea, and fluid retention. Reflex sympathetic stimulation may occur, and concomitant beta-blocker or diuretic therapy is sometimes used to mitigate this. Rarely, a lupus-like syndrome may develop with prolonged use. Close monitoring of blood pressure and clinical status is essential.

🧰 Storage & Handling:

Store sterile ampoules/vials at controlled room temperature, protected from excessive heat and light. Do not use if the solution is discoloured or the vial/ampoule seal is broken. Ensure aseptic technique during preparation and administration, and dispose of used ampoules safely in accordance with clinical waste protocols.

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