Robert Downey Jr.'s next court hearing is likely to be postponed again, according to prosecutors.

Downey, charged with possession of cocaine and a tranquilizer, faces more than four years in prison if convicted. 

His court hearing was postponed from Jan. 29 to Wednesday, when it is likely to be delayed again, Riverside County prosecutor Tamara Capone said. 

"We haven't reached a disposition yet, so we're simply going to continue it," she said. 

Attorneys will seek a court date in mid-March, Capone said. 

Downey, 35, was arrested on Nov. 25 at a Palm Springs hotel. He had just been released from prison in August after serving about a year for violating probation on drug arrests dating back to 1996.