Which? said that more than half of "nuisance" calls were about services such as personal injury or payment protection insurance (PPI) claims.

BBC: Which? calls for 'nuisance call and text' clampdown

The drug giant is facing thousands of personal injury lawsuits related to its withdrawn pain pill Vioxx, and its cholesterol-lowering drug Zocor lost patent protection this summer, allowing cheap generics to eat away at its sales.

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