A proposed deal between Pfizer and Mylan, pharma giants which between them employ around 4,500 people across Ireland could see the spin out of blockbuster and profitable drugs Lipitor and Viagra into a separate company.

A proposed deal between Pfizer and Mylan, pharma giants which between them employ around 4,500 people across Ireland could see the spin out of blockbuster and profitable drugs Lipitor and Viagra into a separate company.

Allergan chief executive David Pyott said he probably won’t follow other drugmakers in making an acquisition in Ireland as a way to lower the company’s corporate taxes.