Suicide do's and dont's: Seven drugs, poisons, and other chemicals that are great to kill yourself with, provided you are into that sort of thing
Obligatory Disclaimer: The intention of this post is not to provide instructions on how to end your life. If you are seeking such information, there are plenty of places to find it on the Internet.
My personal view (since you obviously want to know) on suicide is that sometimes it's okay, particularly as a means of relieving terminal pain and suffering. However, it does bum me out when someone with a potentially treatable mental illness takes their life. I'm not saying that drugs can fix everyone, or even really 'fix' people at all, but they do have the potential to increase an individual's quality of life.
Anyway, if you're thinking about kicking your own bucket, perhaps I could humbly suggest two things? First, do some research. The Wikipedia article on sucide isn't a bad place to start. Or maybe it is, I'm not an expert. Second, there's this thing called the National Suicide Prevention Lifeline. It's capitalized because it's important! If you want to give them a call, their number is 1-800-273-TALK. Just saying.
Okay, back to drugs. To complement my previous post, here are the "do's" of chemical-based suicide. I've kept it to single chemicals, so effective synergistic combos like ethanol and Valium have been excluded.
 Kapur S, Mieczkowski T, Mann JJ. (1992). Antidepressant medications and the relative risk of suicide attempt and suicide. JAMA 268(24): 3441-3445.
 Hawton K, Clements A, Simkin S, Malmberg A. (2000). Doctors who kill themselves: a study of the methods used for suicide. QJM 93(6): 351-357. (link)