Hydralazine (hydralazine hydrochloride) — Uses, Dosage, Side Effects & Safety

Drug class: Antihypertensive; Vasodilator

Overview

Hydralazine is a prescription medication used to treat high blood pressure (hypertension) and heart failure. It works by relaxing the blood vessels, which allows blood to flow more easily and reduces the workload on the heart. This medication is often used when other blood pressure medicines are not effective or suitable. Hydralazine may be used alone or in combination with other antihypertensive agents. For heart failure, it is commonly combined with isosorbide dinitrate. Key points for patients: Take hydralazine exactly as prescribed, even if you feel well. Do not stop taking it suddenly without consulting your doctor, as this can cause your blood pressure to rise quickly. Regular monitoring of blood pressure and follow-up appointments are important while on this medication.

Therapeutic uses

• Hypertension
• Hypertensive crisis
• Preeclampsia/Eclampsia (in combination with other agents)
• Heart failure (as an adjunct in specific cases)

Common side effects

• Headache
• Nausea
• Vomiting
• Diarrhea
• Tachycardia
• Palpitations
• Anorexia
• Lupus-like syndrome

Frequently Asked Questions about Hydralazine

What is hydralazine used for?

Hydralazine is used to treat high blood pressure (hypertension) and heart failure. It helps relax blood vessels, making it easier for the heart to pump blood.

How quickly does hydralazine work?

Hydralazine typically starts to lower blood pressure within 20–30 minutes after oral administration, with peak effects in 1–2 hours.

Can I stop taking hydralazine if I feel better?

No, do not stop taking hydralazine without consulting your doctor. Stopping suddenly can cause your blood pressure to rise rapidly.

What should I do if I experience side effects?

Mild side effects may improve over time. If you experience serious symptoms such as chest pain, severe dizziness, or signs of an allergic reaction, seek medical attention immediately.

Is hydralazine safe during pregnancy?

Hydralazine may be used during pregnancy if clearly needed, especially for severe hypertension, but only under close medical supervision.

Can hydralazine be used with other blood pressure medicines?

Yes, hydralazine is often used in combination with other antihypertensive agents. Your doctor will determine the best combination for you.

How is hydralazine different from other blood pressure medications?

Hydralazine is a direct vasodilator, meaning it directly relaxes blood vessel walls. It is often used when other medications are not effective or suitable.

Educational information only. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.