Eisai Co., Ltd. offers pharmaceutical products in Japan.

It offers Aricept for the treatment of alzheimer's disease/dementia with Lewy bodies; Methycobal for the treatment of peripheral neuropathy; and Fycompa, an antiepileptic drug for the adjunctive treatment of partial-onset and primary generalized tonic-clonic seizures.

The company also provides Lyrica for pain treatment; Dayvigo, an anti-insomnia drug for the treatment of adults with insomnia; Lenvima, an anticancer agent/molecular targeted medicine for the treatment of thyroid cancer, renal cell carcinoma in combination with everolimus, and hepatocellular carcinoma; and Halaven, an anticancer agent/microtubule dynamics inhibitor for the treatment of breast cancer and liposarcoma.

In addition, it offers Pariet, a proton-pump inhibitor for the treatment of gastric and duodenal ulcers, reflux esophagitis, and eradication of Helicobacter pylori infections, etc.; Humira, a fully human anti-TNF-a monoclonal antibody for the treatment of autoimmune diseases, such as rheumatoid arthritis; and Chocola BB plus, a vitamin B2 preparation for rough skin and stomatitis, as well as various products, which include third-class OTC drugs, designated quasi-drugs, and food with nutrient function.

The company was formerly known as Nihon Eisai Co., Ltd. and changed its name to Eisai Co., Ltd. in 1955.

Eisai Co., Ltd. was incorporated in 1941 and is headquartered in Tokyo, Japan.