Pfizer to evade US Taxes with merger
 

"Pfizer Inc. and Allergan PLC are on the cusp of striking a merger deal worth more than $150 billion that would create the world’s biggest drug maker by sales, according to people familiar with the matter.
The takeover would be the largest so-called inversion ever. Such deals enable a U.S. company to move abroad and take advantage of a lower corporate tax rate elsewhere, and have remained popular in the face of U.S. efforts to curb them."

Perhaps this merger will enable Pfizer to reduce the price of Viagra.