Home Alone star Macaulay Culkin's publicist is firing back at tabloid reports suggesting he's a heroin addict fighting for his life.

The former child star's representative has urged the "responsible media" to ignore the story, insisting the actor is not a dope fiend.

The rep tells TMZ.com the story is "not only categorically without merit, but it is also impossibly and ridiculously fictitious... We beseech the responsible media to consider the source and its reputation and to please not perpetuate this destructive and insulting story by pursuing it any further."

The story features on the front page of the new issue of the National Enquirer, with a headline that reads 'Six Months To Live!'.