Levocetirizindihydrochlorid Stada (Levocetirizine)

Levocetirizine, a selective H1‑receptor antagonist, is employed in the management of common allergic disorders that involve histamine‑mediated inflammation.

• Allergic rhinitis: reduces nasal congestion, sneezing, itching and rhinorrhea, leading to improved breathing and sleep quality in patients with seasonal or perennial allergies.
• Chronic idiopathic urticaria: diminishes the number and intensity of hives and associated itching, providing faster symptom control and enhanced daily comfort for affected individuals.

• Levocetirizine is the active R‑enantiomer of cetirizine. It binds with high affinity to peripheral H1 histamine receptors, preventing histamine from initiating the intracellular cascade that causes vasodilation, increased vascular permeability, and sensory nerve activation. By selectively blocking these receptors, the drug reduces classic allergic symptoms while minimally crossing the blood‑brain barrier.

Levocetirizine may cause a range of adverse reactions, which are categorized by frequency and severity.

Common Side Effects

• Drowsiness: mild sedation, especially at treatment initiation.
• Headache: transient cranial discomfort.
• Dry mouth: reduced salivation leading to throat dryness.
• Nausea: mild gastrointestinal upset.

Serious or Rare Side Effects

• Angioedema: swelling of the face, lips or throat that requires immediate medical attention.
• Anaphylactic reaction: severe systemic hypersensitivity that can be life‑threatening.
• Severe skin reactions: such as Stevens‑Johnson syndrome or toxic epidermal necrolysis.

Before initiating therapy, clinicians should consider several safety aspects.

• Assess renal function: dose may need adjustment in patients with impaired renal clearance.
• Avoid use in patients with known hypersensitivity to levocetirizine or other piperazine antihistamines.
• Caution during pregnancy: limited data; use only if potential benefit outweighs risk.
• Monitor for sedation when combined with alcohol or CNS depressants.
• Use with care in elderly patients due to increased susceptibility to drowsiness.
• Store at ambient temperature: keep in the original packaging, protect from moisture and light.

Levocetirizine can interact with other medicines, requiring attention to avoid adverse outcomes.

Major Interactions (Avoid)

• Strong CYP3A4 inhibitors (e.g., ketoconazole): may increase levocetirizine plasma levels.
• Alcohol: additive sedative effect.
• Other antihistamines: risk of excessive anticholinergic burden.

Moderate Interactions (Monitor Closely)

• CNS depressants (e.g., benzodiazepines, opioids): may enhance drowsiness.
• Ritonavir: potential increase in exposure.
• Theophylline: possible alteration of levocetirizine clearance.