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Why don't you call tomorrow and see if they feel if pancreazyme powder. It helps with cats that have diarrhea due to the pancreas's inability to secrete enough enzymes to break down food. It causes and increase in appetite, muscle and body wasting and chronic diarrhea.
Let me know what they think, and if the cat responds.
About 3-5 days and you should still be giving the Pepcid AC.
Thank you and good luck!