Cetirizine: Antiallergic medicine, indicated mainly in cases of hives and rhinitis  ( hay fever ), in addition to other cases of allergy .

Studies have shown that the effect of cetirizine is superior to many other antiallergic drugs when used in the treatment of hives and seasonal rhinitis.

About a molecule

Chemical name: Dicloridrato de cetirizida

Molecule names : Cetirizine

Trade names : Aletir®, Cetihexal, Cetrizin, Cetirizide dihydrochloride, Zetalerg, Zyrtec®

Class : Histamine H1 antagonist (2nd generation)


6 to 12 months : 2.5 mg/day

12 months to 5 years : 2.5 – 5mg/day

>6 years and adults : 5-10 mg/day

Persons with renal and hepatic impairment require dose adjustment!


Children from 6 to 12 months : 2.5mg, 1x/day

Children from 12 months to 2 years : 2.5 mg 1 to 2x/day;

Children > 2 years to 5 years : 2.5 mg 1 to 2x/day or 5mg 1x/day

Children > 6 years and adults : 5 -10mg 1x/day


– allergies , food allergies, drug allergy (rash)

– allergic cough , asthma  (adjuvant treatment)

– rhinitis and hay fever  (allergic rhinitis)

– atopic dermatitis , hives



Adverse effects

Headache, drowsiness, abdominal pain, dry mouth, diarrhea, nausea, insomnia (more frequent in children), fatigue and malaise.


Hypersensitivity to cetirizine, hydroxyne or other component of the formulation.

Drug interactions

CNS depressants, anticholinergics (increased toxicity).

Pregnancy and lactation

Animal studies have not shown harm to the baby, however human studies have not been performed. Use cetirizine during pregnancy only if clearly necessary and on medical advice.

Lactation: present in milk, not recommended.

pharmaceutical presentations

– coated tablet 10mg

– oral solution 1mg/mL


– This medicine has a better effect when taken before contact with the allergen (allergy-causing agent). Take 1 to 3 hours before contact when possible.

– When you are being treated, always take this medicine at the same time of day.

– Avoid driving or doing tasks that require you to be alert until you see how this medicine affects you, as it may cause drowsiness.

– Should be used with caution in people with liver or kidney problems.

– Elderly people are more sensitive to adverse effects.

– Avoid alcohol consumption, as it can increase CNS depression.

– Can be taken with or without food.

– This medicine is often found together with decongestants (eg pseudoephedrine hydrochloride).

Jeanne Kenney
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I’m a stylist trainer, a content creator, and an entrepreneur passion. Virgo sign and Pisces ascendant, I move easily between my dreams, the crazy world I want, and my feet on the ground to carry out my projects.

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