Your question is not an easy one to answer. It could be any number of combo of chemos. There are soooo many!!! Each one has its own list of possible side effects and after effects. To name a few of the most frequently used for OC...
Erbitux (Cetuximab), cisplatin, carboplatin, 5-FU, keytruda (Pembrolizumab), Opdivo (Nivolumab). You will find a link below that is to the main OCF pages. I think you can find many more details about chemo there.
I suggest calling your husbands doctor's office and asking them about what the doc prescribed. It should be written in his chart. You may even find it in the patient appointment contact summary. Usually my doctors give me a summary print out of everything we discussed and what my doc recommends when I check out.
Main OCF site--- Treatment, chemo, etc