With regards to your current problem I am afraid your only option is to buy new pills for them. Clearly they have detected the pill within the food. The next pills you should attempt to pop down their throats the way I describe within this hub, either using a pill popper or your finger. Otherwise try the 'melted cheese' method (if your cats eat cheese).
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Place the pill as far back as possible into the mouth using either your finger or a pill popper. Let go of the cat’s face and watch for lip licking motions that usually indicate the pill has been swallowed. You may try coating the pill with butter to make the delivery smoother and also to leave a pleasant after taste. If possible, squirt a small amount of water into the cat's mouth to promote swallowing. This helps nudge the pill all the way into the stomach where it belongs.
How to Give Your Cat a Pill - YouTube
1. Sit on sofa. Pick up cat and cradle it in the crook of your elbow as though you were going to give a bottle to a baby. Talk softly to it.2. With right hand, position right forefinger and thumb on either side of cat's mouth and gently apply pressure to cheeks while holding pill in right hand. (be patient) As cat opens mouth pop pill into mouth. Allow cat to close mouth and swallow. Drop pill into mouth. Let go of cat, noticing the direction it runs.
Creek Animal Hospital, demonstrates how to give your cat a pill
I have been looking for a product that would make medication dispensing easier and less tramatizing for my pets, especially cats. The Pill Popper fits the bill!! I have four cats and did not have trouble with them swallowing medication when I used the Pill Popper. It worked very well with my dog also. It is easy to load and fits into the mouth with no problems. At last an answer to my administering medication to my pets!! I didn't get bit or scratched one time and did it by myself, whereas I used to get someone to help. Alternatively, you can use a pill gun or pill popper (a device used to hold the pill or capsule and place it in the mouth), again placing the medication on the tongue at the back of your cat’s mouth. Continue to hold your cat’s head in a slightly tilted position with the mouth closed until you see your cat swallow. Follow the pilling procedure with a treat for your cat.