The SFO said it had now concluded that there would be "no prosecution of individuals associated with the company". The investigation into GlaxoSmithKline, meanwhile, related to commercial practices by the firm, its subsidiaries and associated individuals.
"After an extensive and careful examination I have concluded that there is either insufficient evidence to provide a realistic prospect of conviction or it is not in the public interest to bring a prosecution in these cases," said SFO director Lisa Osofsky.