euthanasia - should doctors end the lives of their terminally ill patients?

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Probably the major argument in favor of euthanasia is that the person involved is in great pain. Those who advocate euthanasia present the cases of unbearable pain which cannot be relieved by medicines as reasons for euthanasia. Such a person, who is so sick that he cannot move out of his death bed and is certain to die in the next few months because of his illness, might demand death as a means for respite from his pain. What is more unethical - keeping a person alive in perpetual pain and seeing him die a slow painful death or killing him with medicines (with his consent of course) and assisting him in his suicide to relieve him from pain and die a painless death?