Wow. But let's play along. Which other OTC medicines could being forgetful and accidentally taking a second dose cause death? Not to mention it's hidden in other medications which require careful label reading to discover. fta:

   "The 4 gram per day recommended dose is also the maximum safe dose, one that 
   must not be exceeded, an unusual situation for any drug, particularly an OTC 
   drug, one placing a large fraction of users close to a toxic dose in the 
   ordinary course of use," the report said.

that sounds like something extraordinarily dangerous to be handing out OTC and allowing companies to bury in other medications requiring people to be very careful to not accidentally double dose.