In order to keep my nephew from having enough Oxycontin tabs to commit suicide, how many does it take to commit suicide?
I think this is something that your doctor will have to tell you. I imagine its a function of your nephews general health and his size and other drugs or alcohol that he might take. Have you talked with his doctor about your fears?
You might want to try a National Suicide Hotline and see if they can point you in the right direction as well. http://suicidehotlines.com/