Shares to start trading in Viatris drug firm created from Pfizer's Lipitor and Viagra      

It also marks a move away by Pfizer from medicines under the Upjohn subsidiary that employs around 200 people in Cork. File picture: Larry Cummins

Shares in the new firm Viatris, which was created by Pfizer combining its drugs, including Lipitor and Viagra, that are made by its Upjohn unit in Cork with rival drugmaker Mylan, start trading on the US Nasdaq exchange on Tuesday. 

It is the culmination of plans first announced last summer and which got regulatory approval in the US in recent weeks.