During the 1970s and 1980s, Eli Lilly and Company saw a flurry of drug production: an antibiotic, Keflex, in 1971; a heart drug, Dobutrex, in 1977; Ceclor, which would become the world's top selling oral antibiotic, in 1979; a leukemia drug, Eldisine; an antiarthritic, Oraflex; and an analgesic, Darvon. When generic drugs flooded the marketplace after the expiration of patents for drugs discovered in the 1950s and 1960s, Lilly diversified into other areas, most notably agricultural chemicals, animal-health products, cosmetics, and medical instruments.