Thanks for writing to us.
I hope he is taking percocet (a combination of oxycodone
A repeat paracetamole at this dose in ~4 hours is not a worry.
He may be feeling agitated because of oxycodone. If he is too agitated or if it persists or there are other problems in consciousness/alertness or there is abnormal behaviour, please seek emergency opinion.
A heart rate
of 65bpm is not low and you need not worry about it if it does not fall .
Do not take next tablet till he is totally normal or you have sought a professional opinion.