Adam Jasinski, the winner of CBS’ “Big Brother 9,” was sentenced yesterday to four years in prison on drug and tax charges.

Jasinski, of Delray Beach, Fla., was sentenced in a Boston federal court for attempting to sell 2,000 oxycodone pills in October 2009 to a government witness.

Jasinski pleaded guilty in October to possession with attempt to distribute oxycodone and failure to file a tax return for 2008, the year he won $500,000 on “BB9.”

Before changing his plea to guilty, Jasinski told a judge he was being treated for bipolar disorder and drug addiction.