GlaxoSmithKline forecast lower 2008 earnings due to falling sales of diabetes drug Avandia and increased generic competition, sending shares in Europe's biggest drugmaker down 7.6 percent on Thursday.

Glaxo Smith Kline

Glaxo said sales fell 2 percent to 22.7 billion pounds ($44.4 billion) in 2007, while underlying "business performance" earnings per share (EPS) rose 4 percent to 99.1 pence against analysts' median forecast of 97p in a Reuters Estimates poll.