Levocetirizina Dicloridrato De Levocetirizina Ratiopharm (Levocetirizine Dihydrochloride)

Levocetirizine is a second‑generation antihistamine that alleviates symptoms of IgE‑mediated allergic conditions.

• Allergic rhinitis: reduces nasal congestion, sneezing, itching and rhinorrhea.
• Seasonal allergic rhinitis: provides relief of hay‑fever symptoms during pollen exposure.
• Chronic idiopathic urticaria: diminishes hives and associated itching, improving quality of life.

• Levocetirizine selectively blocks peripheral H1‑histamine receptors, preventing histamine from binding to mast cells and basophils. This inhibition reduces vascular permeability, sensory nerve activation, and smooth‑muscle contraction that drive allergic inflammation. The molecule has limited penetration of the blood‑brain barrier, preserving peripheral antihistaminic activity while minimizing central sedation.

Levocetirizine is generally well tolerated, but some patients may experience adverse reactions.

Common Side Effects

• Drowsiness: mild sleepiness, especially at initiation.
• Headache: transient cranial discomfort.
• Dry mouth: reduced salivation.
• Fatigue: general lack of energy.
• Nausea: mild stomach upset.
• Altered taste: temporary metallic or bitter sensation.

Serious or Rare Side Effects

• Angioedema: swelling of face, lips or tongue.
• Anaphylactic reaction: severe, potentially life‑threatening allergy.
• Stevens‑Johnson syndrome: rare severe skin eruption.
• Thrombocytopenia: low platelet count, may cause bruising.

Before using levocetirizine, consider the following precautions.

• Renal impairment: dose may need adjustment in patients with reduced kidney function.
• Hepatic disease: use cautiously in severe liver dysfunction.
• Known hypersensitivity: avoid if allergic to levocetirizine or other piperazine antihistamines.
• Concomitant CNS depressants: monitor for enhanced sedation when combined with alcohol or sedative drugs.
• Pregnancy and lactation: limited data; use only if benefit outweighs potential risk.
• Store below 25°C: keep in the original packaging, protect from moisture and direct sunlight.

Levocetirizine may interact with other medicines; awareness of key interactions helps ensure safety.

Major Interactions (Avoid)

• Other antihistamines: combined use can increase anticholinergic load and sedation.
• Monoamine oxidase inhibitors (MAOIs): may potentiate central nervous system effects.

Moderate Interactions (Monitor Closely)

• CYP3A4 inhibitors (e.g., ketoconazole, erythromycin): may raise levocetirizine plasma levels.
• Diuretics (e.g., thiazides): can reduce renal clearance, increasing exposure.
• Alcohol and CNS depressants: may enhance drowsiness.
• Anticholinergic agents: additive dry mouth and blurred vision.