Numark Hayfever Relief (Cetirizine Dihydrochloride)

Numark Hayfever Relief contains cetirizine, an antihistamine that acts on the histamine H1‑receptor pathway to relieve allergy symptoms.

• Seasonal allergic rhinitis: reduces sneezing, nasal discharge and itching.
• Chronic urticaria: alleviates hives and associated itching.
• Allergic conjunctivitis: eases eye redness and watering.

• Cetirizine selectively blocks peripheral H1‑histamine receptors, preventing histamine‑induced vasodilation, increased vascular permeability, and sensory nerve stimulation. This inhibition reduces the early‑phase allergic response, decreasing symptoms such as itching, swelling, and rhinorrhea.

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

Common Side Effects

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

Serious or Rare Side Effects

• Severe skin reactions such as Stevens‑Johnson syndrome.
• Anaphylaxis or acute allergic reactions.
• Hepatotoxicity (elevated liver enzymes).
• Thrombocytopenia.
• Cardiac arrhythmia.
• Persistent tachycardia.

Before using Numark Hayfever Relief, consider the following safety measures:

• Pregnancy: consult  
• Breast‑feeding: consult  
• Renal impairment: dose adjustment may  
• Concomitant CNS‑active drugs: monitor  
• Elderly patients: start with a lower  
• Store at below 25°C: keep in the original pack, protect from moisture.

• Cetirizine may interact with several medicines. Review  
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