Not wise as you don't know if your guest have already had paracetamol and if it is included in the cookery it could lead to overdose. Heston Blumenthal has used thrush medication in some of his cookery but he is a professional chef so not wise for the uninitiated.
My father is a chef and he was horrified at the prospect of lemsip in anything as the flavours are artificial and not the most pleasant thing to consume.
Should also say it could conflict with numerous medications you or your guests are on.