Nalerge (Fexofenadine Hydrochloride)

Nalerge (fexofenadine) is used to manage allergic conditions that involve histamine release.

• Allergic rhinitis: reduces nasal congestion, sneezing, itching and watery eyes.
• Seasonal allergic rhinitis: provides relief from pollen‑induced symptoms.
• Chronic idiopathic urticaria: diminishes hives and associated itching.
• Exercise‑induced bronchospasm (off‑label in some regions): may lessen airway irritation caused by histamine.
• Allergic conjunctivitis: eases eye redness and itching.

• Fexofenadine acts as a selective peripheral H1‑receptor antagonist. By binding to H1 receptors on mast cells, basophils and other target tissues, it prevents histamine from triggering the cascade that leads to vasodilation, increased vascular permeability, and sensory nerve stimulation, thereby mitigating the classic signs of an allergic response.

Adverse reactions may occur with any antihistamine and should be monitored.

Common Side Effects

• Headache: mild to moderate intensity.
• Dry mouth: transient sensation of oral dryness.
• Nausea: occasional stomach upset.
• Fatigue: feeling of tiredness without loss of alertness.
• Dizziness: brief episodes of light‑headedness.
• Abdominal pain: mild discomfort in the stomach area.

Serious or Rare Side Effects

• Cardiac arrhythmia: irregular heart rhythm, very uncommon.
• Angioedema: swelling of face, lips or throat.
• Severe skin reactions: such as Stevens‑Johnson syndrome.
• Anaphylaxis: rapid, life‑threatening allergic response.
• Liver enzyme elevation: abnormal liver function tests.
• Hemolytic anemia: rare destruction of red blood cells.

Before using Nalerge, consider the following safety measures.

• Renal impairment: dose adjustment may be required in severe kidney disease.
• Hepatic dysfunction: use with caution in patients with liver disease.
• Pregnancy: consult a healthcare professional before use.
• Driving or operating machinery: avoid if you experience dizziness or fatigue.
• Drug interactions: review concomitant medications for potential effects.
• Store at room temperature: keep in the original packaging, protect from moisture and direct sunlight.

Fexofenadine may interact with several medicines; awareness helps prevent reduced efficacy or increased risk.

Major Interactions (Avoid)

• Ketoconazole: markedly decreases fexofenadine absorption.
• Erythromycin: significantly reduces plasma concentrations.
• Azole antifungals (e.g., itraconazole): may lower effectiveness.

Moderate Interactions (Monitor Closely)

• Antacids containing aluminum or magnesium: can reduce absorption; separate dosing by at least 2 hours.
• Fruit juices (e.g., grapefruit, orange): may modestly decrease bioavailability.
• Alcohol: may enhance sedation in sensitive individuals.