The 31-year-old son of actor Michael Douglas and grandson of screen icon Kirk Douglas pleaded guilty last month to heroin possession and conspiracy to distribute drugs.
The charges stem from Douglas' July 2009 arrest after he allegedly mailed 215 grams of methamphetamine in a package addressed to a government informant's post office box.
Douglas is expected to be sentenced in April to a minimum of 10 years in prison in exchange for his guilty plea.
The New York Post said Cameron Douglas Thursday requested he be released on bail in the interim so he could seek treatment for his addiction to heroin.
However, the judge overseeing the case denied the petition.
The Post said Douglas was spotted at the end of the hearing, smiling at his mother, Diandra, and telling her: "I've been trying to call you. I love you."