The leu opened at 4.251/4.253 to the euro, very close to 4.2505/4.252 at closing the day before.
Later, the leu strengthened further and, at around 10:00 local time (GMT0700), it was trading at 4.2475/4.249 to the euro.
The central bank computed Thursday a leu to euro reference of 4.2525 units, slightly weaker than the previous reference of 4.2488.
On the money market, overnight rates rose to 6%-6.5% a year, from 4.68%-5.18% a year Thursday.