Thanks for posting your query at DoctorSpring.com
I am Dr.R.K and I am pleased to assist you.
4000 mg of acetaminophen is the maximum permissible therapeutic dose per day. The toxic dose however is 7500mg.
You have taken more than maximum allowed therapeutic dose, but slightly less than the toxic dose.
But still I would advise you to contact poison center or go to ER for observation and tests to see the serum levels and to decide whether you need any antidote.
I hope that answers your question.
Let me know if I can assist you further.