Amgen on Monday launched $1.5 billion of debt in a two-part sale. The offering includes $900 million of 10-year notes expected to yield 77 basis points over comparable U.S. treasuries and $600 million of 31-year bonds expected to yield 117 basis points more than U.S. treasuries.

The joint book managers on the sale are Citigroup, Goldman Sachs and Morgan Stanley.