No, you cannot eat Sudocrem. Sudocrem is a topical antiseptic, which means it has to be applied directly on the skin to cure skin irritation, rashes, scratches, cuts, and any other skin conditions. They are not to be ingested!
However, if by accident, or by negligence, you ingest the product, although it may not lead to a terminal consequence, it may cause vomiting, stomach upset, diarrhea, convulsions, and CNS stimulation.
Even though you might have heard or seen somewhere that one can only suffer from these underlying health conditions only if it is ingested in large amounts, it is best not to ingest it at all.