Levocet (Levocetirizine Dihydrochloride)

Levocetirizine Dihydrochloride is used to manage allergic conditions that involve histamine release.

• Allergic rhinitis: relieves sneezing, nasal congestion, and itchy eyes.
• Seasonal allergic rhinitis: controls symptoms triggered by pollen or other seasonal allergens.
• Perennial allergic rhinitis: provides year‑round relief from indoor allergen exposure.
• Chronic idiopathic urticaria: reduces the frequency and severity of hives and associated itching.

• Levocetirizine Dihydrochloride selectively blocks peripheral H1 receptors, preventing histamine from binding to its target cells. By inhibiting this interaction, it diminishes the vascular permeability, nerve stimulation, and smooth‑muscle contraction that underlie the classic signs of an allergic response, thereby alleviating itching, swelling, and nasal congestion.

Adverse reactions may occur with levocetirizine use.

Common Side Effects

• Drowsiness: mild to moderate sleepiness, especially after the first dose.
• Headache: transient tension‑type headache.
• Dry mouth: reduced salivation causing a dry sensation.
• Nausea: occasional mild stomach upset.

Serious or Rare Side Effects

• Angioedema: swelling of face, lips, or tongue requiring urgent care.
• Severe skin reactions: such as Stevens‑Johnson syndrome or toxic epidermal necrolysis.
• Anaphylaxis: rapid onset of systemic allergic response.
• Hepatic dysfunction: abnormal liver enzyme elevations.
• Blood dyscrasias: rare cases of neutropenia or thrombocytopenia.

Before initiating therapy, consider the following safety measures.

• Renal function assessment: adjust use in patients with impaired kidney clearance.
• Alcohol avoidance: concurrent alcohol may increase sedation.
• Elderly caution: monitor for enhanced drowsiness or falls.
• Driving and machinery: avoid operating heavy equipment until individual response is known.
• Storage: Store at below 25°C: keep in the original pack, protect from moisture.

Levocetirizine may interact with other medicines; awareness helps prevent adverse outcomes.

Major Interactions (Avoid)

• Alcohol: additive central nervous system depression.
• CNS depressants (e.g., benzodiazepines): increased sedation risk.
• Ritonavir: may raise levocetirizine plasma levels.

Moderate Interactions (Monitor Closely):\n- Ketoconazole and other azole antifungals: possible increase in exposure.

• Macrolide antibiotics (e.g., erythromycin): may modestly raise serum concentrations.
• Theophylline: potential for altered theophylline metabolism.