I find it really tough. Basically, I'm for it in principle - I saw my grandmother die a terrible extended death in pain and confusion, and I've also held my old cat with heart failure in my arms as she peacefully slipped away with a little injection, being stroked and told how she loved she was, and what a lovely time we had together. Seems like it should be a simple decision.
But. In my day job, I'm a sociologist. Here's my big concern: if euthanasia becomes a potential end treatment, that fundamentally changes the culture of hospitals. I don't believe that power corrupts. I do believe - and its extremely well evidenced - that 'dehumanizing systems dehumanize'. And being in hospital is already dehumanizing, inevitably, to an extent. Whilst there are individual cases where euthanasia seems like it would absolutely be the best option and many cases where I would want it myself, at the level of work and organizational structures, I have a horrible feeling it might be a case of the road to hell being paved with good intentions.
It cuts to the heart of the question of what medicine is, and what its for. Which is obviously a huge question. I have another thought - say it becomes law that a potential treatment is euthanize someone, presumably by giving a massive overdose, in order to relieve suffering. Well say the next person comes along and says doctor, I am also suffering, and what would relieve my suffering is a shitload of benzodiazapines or opiates. The doctor will say no, because that would be extremely bad for you. But if they've just ODed someone, this throws up a pretty glaring inconsistency.
I've got a couple of friends who are doctors, one of whom is an oncologist, and she pretty much thinks the same as me - in principle, she supports it, but has massive reservations and concerns about its implementation. I think perhaps what we should do first is pull back on agressive treatment of the very old/very sick, when quality of life is poor. My grandmother wouldn't have died in fear, pain and confusion with advanced dementia if the hospital hadn't aggressively treated every infection with IV antibiotics, she would have died sooner. Eventually my mother had to actually tell them to stop, for the love of God, just make her comfortable and let her die. No-one broached this conversation with the family, they just kept treating.