Active Ingredient

Fexofenadine

Fexofenadine is an antihistamine used to relieve allergy symptoms. It helps manage conditions like hay fever and urticaria.

Allergies can cause discomfort, and Fexofenadine works to ease symptoms such as sneezing, runny nose, and itching.

Written By Douglas C. Goldberg, MD

Reviewed By Philip Schein, MD

Last Updated 28 Nov 2025

Available Fexofenadine Brands

Allegra

Strengths 120mg, 180mg

Fexofenadine is commonly used to treat allergy-related symptoms. It helps improve quality of life by reducing bothersome signs of allergies.

Fexofenadine works by blocking histamine, a substance in the body that causes allergic symptoms.

As an antihistamine, it prevents histamine from attaching to its receptors, reducing symptoms like itching and sneezing.

This action helps alleviate discomfort without causing significant drowsiness.

Not everyone experiences side effects with Fexofenadine, and many are mild and temporary.

If you experience any severe or persistent symptoms, contact your doctor.

How quickly does Fexofenadine work?

Fexofenadine typically starts to work within an hour of taking it. However, the time can vary from person to person.

Can I take Fexofenadine with food?

Fexofenadine can be taken with or without food, but taking it with water is recommended.

Is it safe to use Fexofenadine long-term?

Fexofenadine is generally considered safe for long-term use, but it’s important to follow your doctor’s advice.

Can Fexofenadine cause drowsiness?

Fexofenadine is less likely to cause drowsiness compared to some other antihistamines, but it can still occur in some people.

Are there any interactions with other medications?

Fexofenadine can interact with certain medications. Always inform your doctor about all the medicines you are taking.