Humex Allergie (Cetirizine Dihydrochloride)

Humex Allergie is used to relieve symptoms associated with several common allergic disorders.

• Allergic rhinitis (hay fever) symptoms such as sneezing, nasal congestion, and itchy nose.
• Seasonal allergy reactions triggered by pollen or other airborne allergens.
• Urticaria (hives) presenting with itchy, raised skin welts.
• Other allergic skin conditions, for example, mild eczema flare‑ups.
• Relief of itching and watery eyes caused by allergic conjunctivitis.

• Cetirizine dihydrochloride acts as a selective peripheral H1‑receptor antagonist. By binding to the histamine H1 receptors on mast cells, basophils and other target cells, it blocks the action of endogenous histamine released during allergic reactions. This inhibition prevents the intracellular signaling cascade that leads to vasodilation, increased vascular permeability, and sensory nerve stimulation, thereby reducing the typical signs of allergy without crossing the blood‑brain barrier in significant amounts.

Like other antihistamines, Humex Allergie may cause unwanted effects, most of which are mild and transient, and should be reported to a healthcare professional if they persist.

Common

• Drowsiness or mild fatigue, especially when first starting the medication.
• Dry mouth or throat sensation that usually resolves with hydration.
• Headache ranging from mild to moderate intensity.
• Nausea or mild gastrointestinal discomfort such as stomach upset.

Serious

• Rapid or irregular heartbeat (arrhythmia) that may require medical evaluation.
• Severe skin reactions, including Stevens‑Johnson syndrome or toxic epidermal necrolysis.
• Swelling of the face, lips, tongue, or throat (angioedema) indicating a possible allergic response.
• Difficulty breathing, wheezing, or throat tightness that could signal a serious reaction.

Before using Humex Allergie, consider the following precautions to ensure safe and appropriate use.

• Assess for known hypersensitivity to cetirizine, other antihistamines, or any component of the product.
• Use caution in patients with impaired kidney function, as clearance may be reduced.
• Evaluate the need for caution in individuals with liver disease, although hepatic metabolism is limited.
• Discuss with a healthcare provider before use during pregnancy or while breastfeeding, due to limited safety data.
• Avoid operating heavy machinery or driving until you know how the medication affects you, especially if drowsiness occurs.
• Keep out of reach of children; accidental ingestion may cause serious effects.

Humex Allergie can interact with other medicines; some combinations should be avoided while others require careful monitoring.

Avoid

• Alcohol or other central nervous system depressants that may increase drowsiness.
• Other H1‑antihistamines, which can lead to additive sedation or reduced efficacy.
• Monoamine oxidase inhibitors (MAOIs) taken within 14 days, due to potential enhancement of antihistaminic effects.

Use with caution

• Sedating antihistamines or sleep aids, as combined use may intensify fatigue.
• Antifungal agents such as ketoconazole that can increase cetirizine plasma levels.
• Theophylline or other bronchodilators, where concurrent use may affect cardiac rhythm.