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Histallay

Active Ingredient:
Fexofenadine Hydrochloride
Origin:
EU

Histallay (Fexofenadine Hydrochloride)

Histallay is an oral tablet that contains the active ingredient fexofenadine hydrochloride, a second‑generation antihistamine marketed in the European Union. It is formulated for systemic absorption and is available without a prescription. The product belongs to the H1‑receptor antagonist class and is intended to relieve allergy‑related symptoms by blocking peripheral histamine activity, providing relief from nasal congestion, itchy eyes, and skin itching associated with seasonal and perennial allergies.

Manufacturer / TM Owner

Dr. Reddy's Laboratories (Uk) Ltd

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Indications & Clinical Uses

Histallay is indicated for the symptomatic treatment of several allergic conditions.

  • Seasonal allergic rhinitis (hay fever)
  • Perennial allergic rhinitis
  • Chronic idiopathic urticaria (hives)
  • Eye itching and watering caused by allergic reactions
  • Nasal congestion and sneezing associated with allergy exposure

How It Works

  • Fexofenadine hydrochloride acts as a selective peripheral H1‑receptor antagonist. By binding to the histamine H1 receptors on mast cells, basophils, and other target tissues, it prevents histamine from triggering the intracellular signaling cascade that leads to vasodilation, increased vascular permeability, and sensory nerve activation. Because it does not readily cross the blood‑brain barrier, central nervous system effects are minimal, allowing symptom relief without sedation.

Side Effects

Like all medications, Histallay may cause unwanted effects, most of which are mild and reversible.

Common

  • Headache
  • Dry mouth
  • Nausea
  • Fatigue

Serious

  • Rare cardiac arrhythmia
  • Severe allergic reaction (anaphylaxis)
  • Elevated liver enzymes

Precautions & Warnings

Precautions help ensure safe use of Histallay, especially in specific health situations.

  • Do not use if you have a known hypersensitivity to fexofenadine or other antihistamines.
  • Use with caution in patients with renal impairment; dose adjustment may be required.
  • The safety of Histallay during pregnancy or breastfeeding has not been established; consult a healthcare professional.
  • Do not exceed the recommended daily dose.
  • Alcohol may increase the risk of mild drowsiness in some individuals.
  • Keep the medication out of reach of children.

Avoid Interactions

Histallay can interact with certain medicines and substances, influencing its effectiveness or safety.

Avoid

  • Antacids containing aluminum or magnesium
  • Ketoconazole
  • Erythromycin
  • Ritonavir

Use with caution

  • Other antihistamines (may increase additive effects)
  • Sedating central nervous system depressants
  • Theophylline
  • Certain antidepressants such as fluoxetine

Frequently Asked Questions

Histallay is used to relieve symptoms of seasonal allergic rhinitis, perennial allergic rhinitis, and chronic idiopathic urticaria.

Yes, Histallay is classified as an over‑the‑counter (OTC) medication in the European Union.

Histallay contains fexofenadine, a second‑generation H1 antagonist that does not readily cross the blood‑brain barrier, so it typically does not cause sedation like many first‑generation antihistamines.

The safety of Histallay during pregnancy has not been established; pregnant or breastfeeding individuals should consult a healthcare professional before use.

Histallay is taken orally, usually as a tablet that is swallowed with water.

There are no specific food restrictions, but large amounts of fruit juices such as grapefruit juice may affect absorption and should be discussed with a pharmacist.

Common side effects include headache, dry mouth, nausea, and mild fatigue.

Alcohol is not strictly prohibited, but it may increase the likelihood of mild drowsiness in some people, so moderation is advised.

Using Histallay together with other antihistamines may increase additive effects and should only be done under medical guidance.

If a dose is missed, take it as soon as you remember unless it is near the time of the next scheduled dose; do not double the dose.

Onset of symptom relief typically occurs within 1 to 2 hours after oral administration.

Histallay is generally not recommended for children under 12 years of age unless a pediatric formulation is specifically approved.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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