Active Ingredient

Levocetirizine

Levocetirizine is an antihistamine used to relieve allergy symptoms. It helps manage conditions like hay fever and chronic hives.

By reducing the effects of natural histamine in the body, it helps alleviate sneezing, runny nose, and itchy eyes.

Written By Douglas C. Goldberg, MD

Reviewed By Philip Schein, MD

Last Updated 28 Nov 2025

Available Levocetirizine Brands

Xyzal

Strengths 5mg, 10mg

Levocetirizine is commonly used to treat allergy-related symptoms. It is effective in managing various allergic conditions.

Levocetirizine works by blocking histamine, a substance that the body produces during an allergic reaction. This helps reduce allergy symptoms.

As an antihistamine, it targets histamine H1 receptors, preventing the typical allergic response.

By reducing the effects of histamine, Levocetirizine helps alleviate symptoms like itching and swelling.

Not everyone experiences side effects from Levocetirizine, and many are mild and temporary. Common side effects include:

If you experience serious or persistent symptoms, contact your doctor.

How quickly does Levocetirizine work?

Levocetirizine usually begins to relieve symptoms within a few hours after taking it.

How long do the effects of Levocetirizine last?

The effects of Levocetirizine typically last for about 24 hours.

Is Levocetirizine safe for long-term use?

Levocetirizine is generally considered safe for long-term use under a doctor’s supervision.

Can Levocetirizine be taken with other medications?

It’s important to discuss with your doctor about any other medications you are taking to avoid interactions.

What should I do if I miss a dose of Levocetirizine?

If you miss a dose, take it as soon as you remember, unless it’s almost time for your next dose. Do not double the dose.