Among the company's more recent pharmaceutical developments are cephalosporin, erythromycin, and Prozac (fluoxetine), a selective serotonin reuptake inhibitor (SSRI) for the treatment of clinical depression. Ceclor, introduced in the 1970s, was an oral cephalosporin antibiotic. Prozac, introduced in the 1980s, quickly became the company's best-selling product for treatment of depression, but Lilly lost its U.S. patent protection for this product in 2001. Among other distinctions, Lilly is the world's largest manufacturer and distributor of medications used in a broad range of psychiatric and mental health-related conditions, including clinical depression, generalized anxiety disorder, narcotic addiction, insomnia, bipolar disorder, schizophrenia, and others.