Overdose?

Will changed a week before overdose death - National - smh.com.au

Isn't it an odd choice to be calling a death by Nembutal an "overdose". According to Wikipedia, there are very few things Nembutal can be used for in humans, and of course its fame now is mainly as euthanasia groups' preferred suicide drug.

Seems a bit like saying someone died of a rat poison overdose.