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8 bennys = 200mg DPH (if 25mg a piece like most are)
50mg of Nyquil (did OP mean 50mg of DXM?)
50mg of Nyquil is a little over a double dose (which also raises the acetaminophen intake, the more dangerous aspect of taking Nyquil specifically and not something which only contains DXM like Delsym
1 shot of 100 proof ethanol = 1 shot of 100 proof ethanol
Eh
I don't think it would kill most people
But doing it over and over would most certainly kill your liver, kidneys and stomach lining after a few years of abuse