My pharmasict just told me today not to take more than 4000 mg. of acetaminophen a day, with the treatment plan I am on. Being that I am only 22 years old and I only weigh 100 pounds, should I worry about my liver already? Should I have it checked? Does it matter how big or small you are or is everyone's liver the same? Sorry, I am not the smartest person in the world when it comes to all of this... That's why I look to you guys for answers. Thanks everyone. I don't know where I would be without you.