Ekweremadu polled 86,088 votes to defeat his closest rival, Mrs. Juliet Ibekaku-Nwagwu of the All Progressives Congress (APC) who scored 15,187 votes.
The Returning Officer, Prof Douglas Nwagbo of the University of Nigeria, Nsukka (UNN) announced the results in Awgu on Sunday.
The News Agency of Nigeria (NAN) reports that with the victory, Ekweremadu holds the senatorial mandate for the 5th time.
Reacting to the development, the deputy senate president said he was humbled by the result because it was the first time a senator would be voted the fifth time in Nigeria.
He applauded the Independent National Electoral Commission (INEC) for smooth and peaceful conduct of the elections. (NAN)