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"There is absolutely no indication that this is anything but an accident," said chief coroner investigator Craig Harvey, the Associated Press reports.
Penn, 40, the younger brother of Sean Penn, was found dead in his Santa Monica condominium on Jan. 24, but results of his autopsy and toxicology tests were not released until Monday.
The primary cause of death was "nonspecific cardiomyopathy," an oversized heart, with the "effects of multiple medication intake," according to a coroner's statement.
"We know he had several prescriptions, including promethazine with codeine, which featured predominantly in his death," Harvey said of Penn, who was described as weighting 300 lbs. at the time of his death. "We don't know how much he ingested or when. There are a lot of 'what ifs' to be factored in."
A full coroner's report with further details will be available in a few weeks, Harvey said.
Penn's movies included Reservoir Dogs, Rush Hour and Starsky & Hutch.
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