Does it make sense to take Contix as a protective drug against Xarelto?

No, there is no medical indication for such use. Admittedly, these drugs do not have clinically relevant interactions that would preclude their combined use. Contix is used for the treatment and prevention of gastric and duodenal ulcers accompanying long-term therapy with NSAIDs painkillers. Xarelto is not a painkiller, so there is no need for Contix. If you need to use a protective drug, in this case it is worth betting on a probiotic that will support the restoration and maintenance of normal intestinal microflora and limit the multiplication of harmful microorganisms. Probiotic will also help to seal the intestinal barrier: Sanprobi Barrier: https://www.gdziepolek.pl/produkty/95137/sanprobi-barrier-kapsulki/apteki?pvid=238181#internetowe