Attorneys representing Spector, known for creating rock music's "wall of sound" recording technique in the 1960s, are trying to get a judge to throw out his incriminating statements.
In a recently filed defense brief, attorney Bruce Cutler claimed that Spector, 64, "was experiencing symptoms of withdrawal from his medications, which could include hallucinations, forgetfulness, serious fatigue, and/or slurring." Police refused or ignored his requests for his medication after they took him into custody at his home, Cutler said. The brief was obtained Wednesday by the Los Angeles Times.
The medications were for treating depression, seizures, stomach acid, migraines and pain, according to defense motions. One was an antibiotic.
Prosecutors, who have until Oct. 21 to formally respond to the filing, declined to comment on Cutler's claims.
Spector faces life in prison if convicted of killing actress Lana Clarkson. Spector has pleaded not guilty to the charges and is free on $1 million bail.
Clarkson starred in Roger Corman's cult film classic "Barbarian Queen." She was working as a hostess at the House of Blues on the Sunset Strip and went home from there with Spector the night she died.
According to transcripts of a police interrogation, Spector initially apologized for accidentally shooting Clarkson but later said she had committed suicide.
Defense lawyers also want Superior Court Judge Larry P. Fidler to exclude evidence of 14 guns seized from Spector's home and the record producer's past misdemeanor firearms convictions.
Fidler ruled in May that he would allow testimony from four women who said Spector had threatened them with guns.
The judge has said he expects trial to begin in January.