An inquest was held at West London coroner's court into Edwards's death at the age of 31 in February.
He was the son of musician and Loose Women host Brenda Edwards.
There was evidence of cocaine toxicity in Edwards' body, assistant coroner Ivor Collett said, adding the cause of death was cardiac arrhythmia, following cocaine use.
The coroner concluded the cause of death was drug-related.
A toxicology report found there was evidence of cocaine use and presence of cocaine and alcohol which probably caused his death.