The merger will bring Wyeth's valuable biotech expertise under the Pfizer umbrella, including products such as Enbrel, a biologic treatment for rheumatoid arthritis. Wyeth and Pfizer have entered into a definitive merger agreement under which Pfizer will acquire Wyeth in a cash-and-stock transaction currently valued at $US68 billion ($101 billion). The boards of directors of both companies have approved the merger.

The Mallesons team is being led by partners Katrina Rathie and Sharon Henrick. "The deal is significant for its dazzling $US68 billion-dollar value in this rather depressed market," said Rathie.

"It shows confidence in 'big-pharma' and the consolidation demonstrates the value of intellectual property rights, research and development, innovation pipeline, know how and consumer brands in the all important healthcare market," said Rathie.

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Wyeth and its animal health division, Fort Dodge, are longstanding corporate clients of Mallesons. Mallesons will work with Wyeth and its New York and London M&A advisors, Simpson Thacher & Bartlett, on the M&A, competition and regulatory aspects of the merger in Australian and New Zealand