Levocetirizine Teva (Levocetirizine Dihydrochloride)

• Levocetirizine acts on histamine‑mediated allergic conditions, providing symptom control across several related disorders.
• Allergic rhinitis: alleviates sneezing, nasal discharge, itching and congestion.
• Chronic idiopathic urticaria: reduces the number and severity of hives and associated itching.
• Allergic conjunctivitis: eases eye itching, redness and watery discharge.

• Levocetirizine selectively blocks peripheral H1 histamine receptors, preventing histamine from binding and triggering the cascade that leads to vasodilation, increased vascular permeability, and sensory nerve activation. By inhibiting this pathway, it reduces the classic signs of allergic inflammation such as itching, swelling, and mucus production without significant central nervous system effects.

Levocetirizine is generally well tolerated, but adverse reactions can occur.

Common Side Effects

• Drowsiness or mild sedation.
• Headache.
• Dry mouth.
• Nausea.
• Dizziness.
• Fatigue.

Serious or Rare Side Effects

• Angioedema or severe swelling of the face, lips, or tongue.
• Stevens‑Johnson syndrome or toxic epidermal necrolysis.
• Anaphylactic reactions.
• Cardiac arrhythmias or prolonged QT interval.
• Hepatic injury (rare).
• Severe hypersensitivity reactions.

Before initiating therapy, consider the following safety measures.

• Renal function assessment: dose adjustment may be required in severe renal impairment.
• Alcohol avoidance: concurrent use can increase sedation.
• Pregnancy caution: use only if the potential benefit justifies the potential risk to the fetus.
• Lactation caution: levocetirizine is excreted in breast milk; weigh benefits against possible effects on the infant.
• Cardiac monitoring: patients with known QT prolongation should be monitored.
• Store at ambient temperature: keep below 25 °C, protect from moisture and retain in the original packaging.

Levocetirizine may interact with other medicines; awareness of the interaction level helps guide clinical decisions.

Major Interactions (Avoid)

• Strong CYP3A4 inhibitors (e.g., ketoconazole, ritonavir): may increase levocetirizine plasma concentrations.
• Concurrent use of other sedating antihistamines: additive central nervous system depression.

Moderate Interactions (Monitor Closely)

• Alcohol and other CNS depressants: may enhance drowsiness.
• QT‑prolonging agents (e.g., certain antiarrhythmics, fluoroquinolones): monitor cardiac rhythm.
• Grapefruit juice: can modestly affect metabolism.
• Antihypertensive drugs: may potentiate hypotensive effects in susceptible individuals.