... night, can it affect your stiomach or liver at that amount
You would need to make sure you are not taking more than 4,000mg of Acetaminophen (Tylenol) in a 24-hour period. If you are only taking the Tylenol PM at night and not taking any Tylenol-containing products during the day, you will be perfectly fine. If taking more than 4,000mg it can cause liver damage/failure and you should consult your physician.
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