Hydralazine Hydrochloride (Hydralazine Hydrochloride USP Tablet) 10mg

Hydralazine Hydrochloride is primarily used to manage hypertension and related conditions. It acts by relaxing blood vessels, which helps to lower blood pressure.

• Hypertension: Reduces blood pressure in patients with essential hypertension.
• Hypertensive emergencies: Used in acute situations to rapidly lower blood pressure.
• Heart failure (as adjunct therapy): Improves heart function and symptoms in patients with heart failure when used alongside other treatments.

• Hydralazine Hydrochloride works by directly relaxing the smooth muscles in the walls of the arterioles. This relaxation leads to a decrease in peripheral vascular resistance, which in turn reduces blood pressure. The mechanism of action is primarily through the activation of guanylate cyclase, leading to an increase in cyclic GMP levels, which causes smooth muscle relaxation.

Hydralazine Hydrochloride can cause various side effects, ranging from common to serious.

Common Side Effects

• Headache: A frequent side effect that may occur due to changes in blood pressure.
• Nausea: Some patients may experience nausea as a result of the medication.
• Dizziness: A common side effect that can be managed by adjusting the dosage.
• Fast heartbeat: Palpitations or tachycardia may occur.
• Low blood pressure: Hypotension can be a side effect, especially with higher doses.
• Flushing: Some patients may experience facial flushing.
• Nasal congestion: A less common but possible side effect.
• Muscle cramps: May occur in some individuals.

Serious or Rare Side Effects

• Lupus-like syndrome: Hydralazine may cause symptoms similar to lupus, such as joint pain, fever, and rash.
• Blood count changes: Anemia, leukopenia, or agranulocytosis may occur.
• Nerve symptoms: Numbness or tingling in the hands and feet.
• Liver problems: Symptoms such as nausea, loss of appetite, and jaundice may indicate liver issues.
• Heart problems: Chest pain, irregular heartbeat, or shortness of breath may occur.
• Allergic reactions: Severe allergic reactions, including hives and difficulty breathing, are rare but possible.

Hydralazine Hydrochloride should be used with caution in certain patient populations and conditions.

• Avoid in coronary artery disease: Patients with coronary artery disease should not use hydralazine.
• Avoid in mitral valvular rheumatic heart disease: Hydralazine is contraindicated in patients with this condition.
• Monitor for lupus-like symptoms: Regularly check for symptoms such as joint pain, fever, and rash.
• Use cautiously in pregnancy: Hydralazine should only be used during pregnancy if the benefits outweigh the risks.
• Monitor blood counts: Regular blood tests are recommended to check for changes in blood cell counts.
• Store at room temperature: Keep the medication in a tight, light-resistant container at 20° to 25°C (68° to 77°F).

Hydralazine Hydrochloride can interact with other medications, which may affect its efficacy or increase the risk of side effects.

Major Interactions (Avoid)

• Monoamine oxidase inhibitors (MAOIs): Concomitant use can lead to severe hypotension.
• Beta-blockers: May reduce the effectiveness of hydralazine in lowering blood pressure.
• Diuretics: Can enhance the hypotensive effects of hydralazine, leading to excessive blood pressure reduction.

Moderate Interactions (Monitor Closely)

• Digoxin: Hydralazine may increase the risk of digoxin toxicity.
• Other antihypertensives: Concurrent use may lead to additive hypotensive effects.
• Nonsteroidal anti-inflammatory drugs (NSAIDs): May reduce the antihypertensive effects of hydralazine.