Pharmaceutical company GlaxoSmithKline is to pay $3 billion (£1.9bn) to settle several US federal investigations into some of its best selling drugs. On 2 July, the company confirmed a provisional settlement reached in November last year after an eight-year investigation. GSK has admitted to marketing antidepressants Paxil and Wellbutrin for unapproved uses. Also, the firm has conceded charges that it held back data about the diabetes drug Avandia.