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, both of which have lost patent protection. The firm's newer key drugs include Cimzia (rheumatoid arthritis, psoriatic arthritis, and Crohn's disease), Vimpat (epilepsy), Neupro (Parkinson's disease and restless leg syndrome), and Briviact (epilepsy).