The merger of pharmaceutical giants GlaxoWellcome and SmithKline Beecham (SB) is expected to result in a raft of jobs losses within the newly combined PR unit.
The two organisations merged last month to create the UK's third largest company GlaxoSmithKline (gsk).
Glaxo Wellcome's corporate communications department was headed by Geoff Potter, who has taken over as corporate communications director for the merged department.
Under the former SB structure, communications was headed by corporate affairs chief, James Hill. He remains in an as yet undetermined role.
'There will inevitably be fewer jobs in this new department, as always happens with a merger,' said gsk head of media, Martin Sutton.
However, Sutton remained tight-lipped as to the extent of the job losses.
'We are still appointing, so do not have figures of current staff levels and we do not think it is appropriate to talk about the situation that was in place before the merger in terms of job numbers,' he said.
The merged team will be based at the former SB base at Brentford, which is currently undergoing construction work as part of the merger.
gsk continues to retain the 20 UK PR agencies used by the two pharmaceutical companies prior to the merger. Between them the agencies promote between 50 to 75 brands.
This week gsk launched its new corporate identity, including the unveiling of its new logo.