I agree with Critters above suggestion and also wanted to recommend trying fancy feast and baby food. I've had much success with getting anorexic cats to eat with those 2 and you can get them at the supermarket or petstore. I'm not sure with A/D whether a vet clinic will sell it to you without them seeing the animal because it is a prescribtion diet. I know the 2 clinic's that I worked at wouldn't but others may be different.
Good Luck!
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Let me know if you have any other questions
Good Luck &
Best Fishes