UPDATE 2-Constellation Brands credit facility amended

* Amends senior credit facility

* Extends maturity date of $650 mln credit facility

* Extends $300 mln of $1.2 billion term loan by 2 years

* Plans to help prepay other debt, lower interest expense (Recasts with details from filing, stock activity)

NEW YORK, Jan 26 (Reuters) - Constellation Brands Inc (STZ.N) said it has reached an agreement to extend the maturity of $650 million of its revolving credit facility by two years until June 5, 2013 in a bid to prepay some other debt and lower interest expense.

The U.S. wine and spirits maker has also extended the maturity date of $300 million of its $1.2 billion term loan by two years to June 5, 2015.

The changes reduced the total revolving loan commitments until June 5, 2011 to $842.0 million from $900.0 million, it said in a filing.

The maker of Robert Mondavi, Clos du Bois and Ravenswood wines said it wanted to take advantage of its current position and improved credit markets to extend the debt maturities, and prepay its 2012 senior subordinated notes.

It intends to give notice on Tuesday of plans to exercise its option to redeem all $250 million of its outstanding 2012 senior subordinated notes.

"Our current focus on debt reduction remains unchanged," Constellation Chief Financial Officer Bob Ryder said in a statement.

Its shares were down 4 cents at $16.57 on the New York Stock Exchange. (Reporting by Dhanya Skariachan, editing by Gerald E. McCormick, Dave Zimmerman)