I used to get Dilantin injected intravenously every four hours for a few months to prevent seizures from head trauma. I liken the burning to that of nettles, only coursing thru your veins. They eventually had to sedate me for the pain and anxiety of those Dilantin injections. It killed off a few good veins from phlebitis too.
Not to worry, this just uses the Sodium Formate as a catalyst INSIDE the cancer cells.............
https://en.wikipedia.org/wiki/Sodium_formate