Vertex Pharmaceuticals Incorporated engages in discovering, developing, manufacturing, and commercializing small molecule drugs for the treatment of serious diseases worldwide. Its products include telaprevir, a prescription medicine used for the treatment of patients with genotype 1 hepatitis C virus (HCV) infection; and Ivacaftor, a prescription medicine used for the treatment of cystic fibrosis. The company markets its products under the INCIVEK brand name in the United States and Canada; INCIVO brand in the United Kingdom, Germany, France, Sweden, Austria, Finland, Denmark, Switzerland, and Norway; KALYDECO brand in the United States; and TELAVIC brand in Japan. Its drug candidates comprise VX-222, a Phase II clinical trial drug candidate, and ALS-2200 and ALS-2158, a Phase I clinical trial drug candidates that are designed to inhibit the replication of HCV; VX-809 and VX-661, a Phase II clinical trial drug candidates that improve the function of defective cystic fibrosis; VX-509, a Phase II clinical trial drug candidate for the treatment of patients with rheumatoid arthritis and other immune-mediated inflammatory diseases; VX-765, a Phase II clinical trial drug for the treatment of epilepsy; and VX-787, an investigational drug candidate for the treatment of influenza A. The company was founded in 1989 and is headquartered in Cambridge, Massachusetts.