Heather Patricia Dale McKenzie, 67, had been holidaying in Australia with her husband James when she died on board the cruise ship Silver Whisper on the night of February 14, 2018.

In findings released on Wednesday, Coroner Simon Cooper ruled Ms McKenzie's death to be the result of an unfortunate drug interaction with toxic levels of alcohol.

"There is no evidence to suggest the involvement of any other person in her death nor that her death was the result of voluntary and intentional acts on her part," Coroner Cooper said.

Coroner Cooper said Mrs McKenzie's medical history indicated she was a regular and heavy consumer of alcohol.

"Her medical records indicated in 2009 she was treated for falling down the stairs due to excessive alcohol consumption," he said.

"Mrs McKenzie's daughter confirmed that her mother was an alcoholic and that her consumption of alcohol increased in severity as she aged."

Coroner Cooper noted Mrs McKenzie had been diagnosed with hypertension in 2014 resulting in the prescription of amlodipine, a medication used to treat high blood pressure and coronary artery disease.

On the night of her death, Coroner Cooper said it was evident Mrs McKenzie and her husband consumed a considerable amount of alcohol before going to bed at 10.30pm.

Mr McKenzie woke at 1.45am and found Mrs McKenzie unconscious on the floor next to the bed.

Mrs McKenzie was administered adrenaline, first by the ship's doctor and nurse and then by Ambulance Tasmania, but she could not be revived.

"Within a short time, police officers attended and spoke with all parties involved," Coroner Cooper said.

"Police noted the cabin was tidy. There were no apparent signs of a struggle or any disturbance.

"Among what appeared to be vitamins and supplements were Mrs McKenzie's prescription medications, amlodipine 5mg and apo-raloxifene 60mg."

Coroner Cooper said an analysis of samples taken during an autopsy showed Mrs McKenzie's blood alcohol concentration was highly elevated.

"That analysis indicated that at about the time of her death, Mrs McKenzie's blood contained alcohol of 0.337 grams per 100 millilitres of blood, caffeine and 0.05 mg/L of amlodipine - a level greater than therapeutic" he said.

"Blood alcohol concentrations in excess of 0.4 grams per 100 millilitres are potentially fatal and may cause loss of consciousness, respiratory failures and, without supportive care, death."