The leu closed at 4.381/4.3835 per euro, almost 0.4% lower from 4.3655/4.3665 per euro Wednesday.
It opened slightly down at 4.370/4.372 per euro and gained slightly in the morning, before returning to losses.
“The leu weakened to 4.39 to the euro, but the central bank intervened and sold euros. The volumes today were among the highest this year,” said one dealer.
Elsewhere in the region, the leu’s peers were gaining around 0.7% versus the euro.
The central bank set the leu’s reference at 4.3672 per euro, the lowest rate in the past 21 months. Against the US dollar, the leu’s reference lost 0.31% on the day to 3.3478 units.
On the money market, overnight rates were flat at 1.6%-2.1% a year.