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Hydralazine is used in the treatment of increased blood pressure
It is also used in combination with long-acting nitrates in heart failure.

How it works

Hydralazine works by relaxing blood vessel which lowers blood pressure and allows more blood and oxygen to reach the heart and other organs.

Common side effects

Headache, Loss of appetite, Nausea, Vomiting, Diarrhoea, Palpitations, Increased heart rate, Angina pectoris

Available Medicine

Expert advice

  • Inform your doctor if you have had a heart attack, have sensation of pressure, squeezing or pain due to insufficient blood supply to the muscles of the heart (angina pectoris) or suffered from paralysis of one or more parts of the body due to insufficient blood supply to the brain (stroke), or have liver or kidney disease.
  • Precaution should be taken if you have been told you are a slow acetylator (persons with reduced ability to metabolize drugs so that hydralazine accumulates in blood).
  • Caution has to be taken before operating an automobile or machinery or engaging in activities requiring mental alertness and coordination as hydralazine can cause dizziness and unusual tiredness.
  • Tell your doctor if you are or planning to become pregnant or are breastfeeding.

Frequently asked questions



What is Hydralazine?
Hydralazine belongs to a drug class called as vasodilators. It acts by relaxing the blood vessels, thereby relieving high blood pressure and/or improving the blood flow in narrowed blood vessel


What is Hydralazine used for?
Hydralazine is used in the treatment of moderate to severe hypertension (high blood pressure), hypertensive crisis and moderate to severe congestive heart failure (failure of heart, resulting in fluid buildup in the lungs other body tissue or both).

Content on this page was last updated on 08 March, 2017, by Dr. Varun Gupta (MD Pharmacology)