Cetirizine is an antihistamine that helps relieve allergy symptoms by blocking histamine, the chemical that triggers things like sneezing, runny nose, itchy eyes, and hives. It can also help with itching and redness from urticaria (hives).

Quick scoop

  • What it does: Reduces allergy symptoms.
  • Common uses: Hay fever, itchy/watery eyes, hives, and some skin/allergic reactions.
  • How it works: Blocks histamine receptors in the body, which lowers the allergic response.

What to expect

Cetirizine is often chosen because it usually causes less drowsiness than older antihistamines, though some people still feel sleepy.

If you want, I can also tell you about side effects , how fast it works , or whether it’s safe to take with other meds.