So far as I know, standard superglue doesn't contain any arsenic, but it can irritate the wound - degradation products and impurities - leading to infection. The medical stuff is a different cyanoacrylate that degrades far more slowly and doesn't irritate.
When I worked in a lab, I thought I might be able to sneak a tube onto an order from a bioscience supplies catalogue but it cost a fortune - at least £30 for a tiny vial - and could have been noticed (incidentally the catalogue had the most harrowing chapters in a mail order catalogue I have ever seen: pages of immobiliser tables for operating on animals and of decapitators).