Allegra (fexofenadine) (fexofenadine hydrochloride) — Uses, Dosage, Side Effects & Safety

Drug class: Second-generation antihistamine (H1 receptor antagonist)

Overview

Allegra (fexofenadine) is a non-drowsy antihistamine used to relieve allergy symptoms such as sneezing, runny nose, itchy or watery eyes, and itching of the throat or nose. It is also effective in treating symptoms of chronic idiopathic urticaria (hives), including itching and rash. Fexofenadine works by blocking the action of histamine, a substance in the body that causes allergic symptoms. Unlike some older antihistamines, Allegra is less likely to cause drowsiness because it does not easily cross into the brain. Key points: Allegra provides fast, effective relief from allergy symptoms, is suitable for adults and children (with age-appropriate formulations), and is generally well-tolerated with a low risk of sedation.

Therapeutic uses

• Allergic rhinitis
• Chronic urticaria

Common side effects

• Headache
• Nausea
• Dizziness
• Fatigue
• Dyspepsia
• Somnolence
• Dry mouth

Frequently Asked Questions about Allegra (fexofenadine)

What is Allegra?

Allegra is the brand name for fexofenadine, a second-generation antihistamine.

What is the generic name for Allegra?

Fexofenadine hydrochloride.

Does Allegra make you drowsy?

No — it is non-sedating for >99% of people.

Is Allegra non-drowsy?

Yes — designed not to cross the blood-brain barrier.

What is Allegra-D?

Allegra combined with pseudoephedrine (decongestant).

Allegra vs Allegra-D – what's the difference?

Allegra-D contains pseudoephedrine for nasal congestion; regular Allegra does not.

Can you take Allegra with fruit juice?

Avoid grapefruit, orange, and apple juice — they reduce absorption by up to 70%.

Why can't you take Allegra with orange juice?

Organic anion transporting polypeptides (OATP) in juice inhibit intestinal absorption.

Educational information only. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.