Treating urticaria or also known as hives can be based on the cause as well as the severity of the symptoms. When hives erupt, oral antihistamines like diphenhydramine can be very effective for alleviating the hives. There are non-drowsy antihistamines that are available to block the release of histamines which can prevent an outbreak of hives. They are: - Loratadine - Fexofenadine - Cetirizine - Desloratadine - Levocetirizine If you are noticing hives erupt on your body, as well as many other symptoms, visit our urgent care walk-in clinic. For more information, contact Columbia Clinic Urgent Care today! We serve patients from Portland OR, PDX, Happy Valley OR, Tigard OR, Milwaukie OR, Cedar Hills OR, Cedar Mill OR, Lake Oswego OR, Oak Grove OR, Vancouver WA, Aloha OR, Minnehaha WA, Gladstone OR, Tualatin OR, West Linn OR, Fairview OR, Oregon City OR.