Shareholders of Icos ( ICOS) voted Thursday to accept a $34-a-share buyout offer from Eli Lilly ( LLY).

The vote enables Lilly to take full control of the impotence drug Cialis, which Icos developed and whose profits were shared via a marketing agreement. The $2.3 billion acquisition is expected to close Jan. 29.

Icos said 85% of its shares outstanding voted on the proposal, and that 77% of the votes supported the deal.