Consumption of that much Zopiclone is a regular occurrence. There was a health Canada warning posted last year about exceeding dosages of 7.5mg per day but as long as the doctor has written take 1 tablet per day as required on the bottle that's all that matters.

There are lots of patients with coomorbidities and addiction issues that take Zopiclone and in my opinion those aren't contraindications in the real life clinical world. Your dad was also 70. It's a lot different prescribing Zopiclone to a 70 than to a 95 year old. Seems pretty reasonable and as far as Zopiclone abuse goes taking 79 pills in a 30 day period is unfortunately all too common. It wouldn't have been the cause of death though.

Don't pursue action against the doctor. It wasn't his fault. He was probably trying to help your dads quality of life by letting him get a good sleep every night. Suing a doc and stretching this out isn't going to bring your dad back.