GlaxoSmithKline plc (GSK) (LSE:_GSK, NYSE:_GSK) is a British multinational pharmaceutical, biologics, vaccines, and consumer healthcare company headquartered in London, United Kingdom. It is the world's fourth-largest pharmaceutical company measured by 2009 prescription drug sales (after Pfizer, Novartis and Sanofi). GSK has a portfolio of products for major disease areas including asthma, cancer, virus control, infections, mental health, diabetes, and digestive conditions. It also has a large consumer healthcare division which produces and markets oral healthcare and nutritional products and over-the-counter medicines including Sensodyne, Boost, Horlicks, and Gaviscon. GSK has a primary listing on the London Stock Exchange and is a constituent of the FTSE 100 Index. As of December 2011, it had a market capitalisation of _73.8_billion, the fifth-largest of any company listed on the London Stock Exchange. It has a secondary listing on the New York Stock Exchange.
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