Is this a pill you currently take? If so I'd highly suggest you find a different one. As for dying from 5, I wouldn't know, but in most cases overdoses of meds will cause some sort of suffering to varying degrees.......
Depending on what the dosage is, I would suggest calling your dr/phamacist/poison control. If the normal dosage is 5, no biggie, if you need to build up to 5, call the dr/phamacist, if you are only supposed to ever take 1, then call poison control.