UCB is a Belgium-based biopharma firm focused on the development of novel therapies for the treatment of central nervous system and immunologic diseases. Historically, revenue was derived from allergy medicine Zyrtec and epilepsy drug Keppra, which have both lost patent protection. The firm's key products are Cimzia (immunology), Vimpat (epilepsy), Neupro (Parkinson's disease and restless leg syndrome), Briviact (epilepsy), Bimzelx (psoriasis), Evenity (osteoporosis), Nayzilam (cluster seizures), and Fintepla (Dravet Syndrome and Lennox-Gastaut Syndrome).