If he's taking Norco, it's at least 5.2 grams, which is above the threshold to cause liver failure. But you can do a cold water extraction on the pills to filter out the acetaminophen. You could also take some N-Acetyle Cysteine with it, which is what they give people who try to commit suicide by OD'ing on Tylenol.
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"Returning hate for hate multiplies hate, adding deeper darkness to a night already devoid of stars." - Martin Luther King, Jr.