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Hello. I'm sorry to hear about Fraggie. Lymphoma is a tough diagnosis to hear.
There is not really a medication to help here. Sometimes we'll use gas-x (phazyme, simethicone) in dogs, but I haven't used it in cats. I think it could be tried, but it would have to be mixed into a solution to get the dose down.
I would lean more toward changing the diet to a high fiber diet that may get the colon function more normal. I would go with Royal Canin fiber response. This is a good diet for these cats.