Hydralazine is a medication primarily used to treat high blood pressure, also known as hypertension. It works by relaxing the blood vessels, allowing blood to flow more easily, which helps to lower blood pressure. Hydralazine is often prescribed when other medications are not effective or suitable for a patient. This drug can be taken orally in tablet form or administered via injection in a hospital setting. Common side effects may include headaches, dizziness, and rapid heartbeat. It is important for patients to follow their healthcare provider's instructions and have regular check-ups to monitor their blood pressure and overall health.