Hong Kong (CNN Business) GlaxoSmithKline and Pfizer are combining their consumer healthcare businesses in a multibillion-dollar merger.

The two pharmaceutical giants — which own household names like Advil and Tums — said Wednesday that the new company would have combined sales of $12.7 billion a year.

The merger will bring together Pfizer's big sellers like Centrum and Caltrate with GSK's top brands, including Excedrin and Nicorette.

GSK ( GSK ), which is headquartered in Britain, will own just over two-thirds of the joint venture, with US-based Pfizer ( PFE ) holding the rest.

After the tie-up, GSK said it plans to split in two by spinning off the new consumer healthcare business and listing it in London within three years. GSK's remaining operations will be focused on making prescription medicines and vaccines.

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