The best treatment for urticaria is to avoid the substance that causes it. This can range from staying away from food or medication that you notice causes the reaction, or by avoiding exposure to dust, pollen, insect bites, latex, and poison ivy, among others.
Urticaria that is caused by injection or ingestion of an allergen can cause the most severe symptoms and lead to anaphylactic shock. Drugs such as aspirin, amaryl, penicillin, sulfonamides and anticonvulsants can cause this condition. Food allergies such as the most common shellfish and nut allergies can cause a reaction as well. Insects bite allergy are another culprit.
For relief in the event that symptoms present themselves, antihistamines and corticosteroids are the drugs of choice for the treatment of urticaria.