LONDON (AP) — Pfizer Inc. was turned down twice by fellow drugmaker AstraZeneca PLC, but the maker of Viagra and Lipitor said Monday that its proposed $100 billion acquisition makes sense for shareholders of both companies, and it’s considering its next steps.

A tie-up would bring new and complementary products to Pfizer, executives said on a conference call, important as patents on profitable medicines expire. Pressure on Pfizer for a deal also may be coming from a desire to save big money on taxes on the piles of cash it earned and keeps overseas.