Eminem turned to Dr. Dre to help him get out of his funk when the two hit the studio to work on the Detroit lyricist's post-hiatus comeback LP, Relapse. Now, it looks like the tables have turned.

On Dre's "I Need a Doctor" — the second leak in as many days from the producer's long-awaited Detox — Em lowers the boom on his mentor saying his "perfectionist" rep is leaving the legend stuck in the mud.

"It hurts when I see you struggle/ You come to me with ideas/ You say they're pieces, so I'm puzzled," Eminem raps over the Alex da Kid produced-number. " 'Cause the sh-- I hear is crazy/ But you're either getting lazy/ Or don't believe in you no more/ Seem like your own opinion is not one you can form/ Can't make a decision/ You keep questioning yourself, second guessing, it's almost like you're begging for my help/ Like I'm your leader, you're supposed to be my mentor/ I can endure no more/ Don't you remember who you are."

Throughout the track, an emotionally charged Eminem references his own struggles and Dre's assistance and notes the super-producer's personal troubles as well, citing his son's death. Dre then rhymes about the pair's history, from "Guilty Conscience" to his own indecisiveness.

"Went through friends, some of them I put on, but they just left," Dre raps. "They said they was riding to the death/ But where the f--- are they now, now that I need them?/ I don't see any of them, all I see is Slim."

Last month, Eminem revealed he and Dre were in the studio, presumably putting the final touches on Detox. "I'm in the studio with Dre now, let's just say that," Em said in an interview on his Shade 45 satellite radio station. "Pretty soon he's going to make a beat and I might rap on it."

Do you think Dre's Detox will ever be completed? Tell us in the comments!