How can I treat urticaria?

Antihistamines. Antihistamines are the primary treatment for hives. Long acting ones like zyrtec or Allegra (fexofenadine) are often effective and easier to take than short acting ones like benedryl. If the hives are persistent or recurrent, see your doctor.
Hives. Urticaria is the medical name for hives. This is an allergic reaction to something that has entered into the body, by either eating, or breathing. It causes itching swellings of the skin, and sometimes that lips and airway. It is almost never life threatening but is annoying and scarey. It is produced by the release of histamine in response to the allergy, and it is treated with oral antihistamine.