 Royalty Pharma Plc RPRX, -1.42 said Monday it agreed to pay up to 1.125 billion for drug royalties owned by Ionis Pharmaceuticals Inc. IONS, 1.00 . The royalties include Ionis interests in Biogens BIIB, 2.82 Spinraza nusinersen medicine and Novartis NVS, 1.64 pelacarsen. 