Eli Lilly and Co. is selling worldwide rights to its hypoglycemia nasal treatment Baqsimi to Amphastar Pharmaceuticals Inc. in a deal potentially worth over $1 billion. Under the agreement, Amphastar, of Rancho Cucamonga, Calif., will foot a $500 million cash payment on closing, and will pay Indianapolis-based Lilly an additional $125 million on the one year anniversary of closing. Lilly is also eligible to receive milestone payments of up to $450 million, based on annual sales of $175 million and $200 million, and on total net sales over five years of $950 million.