Urticaria may be acute or chronic. As opposed to acute urticaria, chronic urticaria is defined by recurrent episodes occurring at least twice a week for 6 weeks (Grattan, Sabroe, & Greaves ...

Also approved for chronic idiopathic urticaria (CIU) – hives caused by an allergic reaction to a food or drug – the new formulation developed by Genentech prevents the need for healthcare ...