OTC medication is OTC for a reason. They won't cause a death unless you're a frail older person. It really varies on your health conditions, weight, etc. Generally, you'll cause yourself liver failure and that'll be a painful death.
There are OTC medications that you can get but you'll need to mix them with stuff that isn't OTC.
Liver failure isn't worth it. You'll end up more embarrassed about how you look like a Simpson character. That's the effect liver damage has on you physically.