What is Zyrtec?

Cetirizine (trade names Zyrtec, Reactine) is a second-generation antihistamine used in the treatment of hay fever, allergies, angioedema, and urticaria. It is a major metabolite of hydroxyzine, and a racemic selective H1 receptor antagonist.

Second-generation antihistamines like cetirizine are less able to cross the blood-brain barrier and therefore have diminished effects on the central nervous system compared to first-generation drugs: for instance they are less likely to induce drowsiness or to interfere with memory formation.

Questions and answers on "Zyrtec"

I have an insect bite that is very itchy and very swollen. I have taken 10 mg tablet of Zyrtec 12 hours ago. The itchy ness has increased. I have...

doctor1 MD

Hello.Cetirizine can be taken twice a day for treating your itchy.It is also advisable to apply Hydrocortisone cream twice a day and local ice...

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Two nights ago while i was sleeping i felt this rash forming on my right arm , i thought but maybe it was a spider bite reaction but i am not sure....

doctor1 MD

Thanks for writing in.
The rash you are describing can be herpes zoster,insect bite contact dermatitis etc.
Keep the area clean and dry.You can...

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