Overdose - Bad Codeine Experience - Too Much?

[R3D_D34D]

Hi, SWIM did a CWE on 48 x 10codein/500paracetemol pills and drank it all last week, he felt pretty good for about 30mins then experienced extreme nausea including a need to breath deeply (panting) and a feeling in the stomach like he needed to vomit but when he tried nothing would come up. It was a pretty shitty feeling which lasted about 6hours although there was some moments when he felt great.
So SWIM's thinking maybe 450mg was way too much considering he has no opiod tolerance?
He's about to do another CWE on 16 x 12.8codeine/200ibuprofen, would this be a more sensible dose?
And SWIM's main question is: is there anything he can do to hold back the nausea? like is there any other OTC drug SWIM could take to prevent the nausios feeling?