My idea is not to.
By no means am I pro-life but as has been mentioned many atime on here overdose on OTC or prescription is a bad idea.
You would need a LOT of medication to OD (it's usually a minimum of at least 10x the prescribed highest dose if not more). Your death won't be quick or painless. You will be in agony the whole way through and die very slowly. That's assuming it works. Overdoses have a very low success rate (I think it's something like 8%).
For more information please consider looking at the resources thread