https://www.vetsurgeon.org/f/clinical-questions/24646/losec-vs-omeprazole-mups We have these two available from our supplier and the former is more expensive than the latter. I can't see any difference except the Losec is omeprazole and the MUPS version is omeprazole magnesium. Can we use the two interchangably? en-USTelligent Community 10