 [ Symptoms ] what is the best skin care routine to prevent aging [ Disease ] it does not take many acetaminophen tylenol pills to cause serious liver damage the absolute maximum daily dose of acetaminophen for adults is 4000mg people should avoid taking more than the maximum daily dose of acetaminophen in order to avoid permanent liver damage if your friend took acetaminophen on purpose to hurt him  or herself i hope she received appropriate psychological help acetaminophen overdose is not an effective way to commit suicide it can possibly cause a person much pain and suffering however wishing you and your friend all the best