Dr. Dre Accuses Ex-Psychiatrist of Maliciously Turning Son Against Him

10/11 5:32 AM PT -- Dr. Charles Sophy 's attorney, Christopher Frost , tells TMZ ... "All mental health professionals work with individuals and families at their most vulnerable and emotionally challenging times of their lives. However, threatening and harassing someone as a means to express one’s emotions is an unacceptable behavior that the world at large cannot tolerate. Unfortunately, Mr. Young’s recent conduct since the filing of the complaint only perpetuates his chosen consistent pattern of behavior. This dispute is about his consistent pattern of negative and abusive behavior and nothing else."

Dr. Dre 's firing back against his former psychiatrist, Dr. Charles Sophy , a day after the shrink filed a lawsuit against the music mogul ... claiming Sophy tried to turn Dre's own son against him.

In a legal letter obtained by TMZ -- sent back in February, 2023 -- Dr. Dre's lawyer, Howard King , rips into Sophy, claiming the doc committed malpractice and breached his duty of trust.

DR. DRE AND NICOLE HAPPIER TIMES

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King expressed a similar sentiment to TMZ in response to Sophy filing his lawsuit Wednesday, accusing Dre of threatening him -- however, the letter paints a more serious picture of the alleged havoc wreaked by Sophy.

King claims the shrink "slandered" Dre "in a malicious effort to convince his son to turn against him" ... as a means of helping Dre's then-estranged wife Nicole get an advantage in the divorce.

King claims this action resulted in Sophy poisoning Dre's relationship with his son.

Sophy, on the other hand, feels he's the victim.

As we reported, Dr. Sophy is suing Dre for $10 million ... accusing the music producer of bombarding him with abusive and menacing messages after working with Dre and Nicole to help them mediate their divorce.

Originally Published -- 10/10 1:31 PM PT