Letizen

Cetirizine, the active ingredient in Letizen, is a second‑generation antihistamine presented as an oral tablet for systemic use. It alleviates symptoms of allergic rhinitis, chronic urticaria and allergic conjunctivitis in adults and children.

GNH USA supplies Letizen as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide, providing reliable sourcing, regulatory support and consistent product quality across multiple markets. The company adheres to stringent quality standards, ensures traceability, and offers flexible logistics to meet the needs of healthcare providers in Europe, Asia and Africa.

Cetirizine is used to manage allergic conditions by blocking peripheral H1 receptors.

Allergic rhinitis: reduces nasal congestion, sneezing and itching. Urticaria: relieves hives and associated itching. Allergic conjunctivitis: diminishes eye redness, tearing and itching.

Cetirizine may cause adverse reactions, most of which are mild and reversible.

Common Side Effects: - Dry mouth: mild sensation of oral dryness. - Headache: transient mild headache. - Drowsiness: occasional mild somnolence, less frequent than first‑generation antihistamines. - Fatigue: feeling of reduced energy. - Nausea: mild stomach upset.

Serious or Rare Side Effects: - Anaphylaxis: rare severe allergic reaction requiring immediate medical attention. - Severe skin reactions: such as Stevens‑Johnson syndrome or toxic epidermal necrolysis. - Cardiac arrhythmia: very rare reports of rhythm disturbances. - Hepatic dysfunction: uncommon elevation of liver enzymes. - Blood dyscrasias: rare cases of neutropenia or thrombocytopenia.

When prescribing cetirizine, consider the following precautions to ensure safe use.

Renal impairment: adjust dose in patients with severe kidney dysfunction. Elderly patients: monitor for increased sedation or confusion. Pregnancy and lactation: use only if clearly needed after risk‑benefit assessment. Concomitant CNS depressants: avoid excessive drowsiness when combined with alcohol or sedatives. Driving and machinery: caution if experiencing any degree of drowsiness. Store at ambient temperature: keep below 25 °C, protect from moisture and light in original packaging.

Cetirizine can interact with other medicines, influencing its efficacy or safety.

Major Interactions (Avoid): - Ketoconazole or erythromycin: may increase cetirizine plasma levels, raising risk of side effects. - Theophylline: can reduce antihistamine effect, leading to inadequate symptom control. - Alcohol: additive CNS depression may cause marked drowsiness.

Moderate Interactions (Monitor Closely): - Ritonavir: may modestly raise cetirizine concentrations. - Cimetidine: can slightly increase cetirizine exposure. - Other antihistamines: combined use may enhance sedation.