any suggestions for mild flea treatment for aged, sick kitty?

[BigmanPigman]

6. When both of my dogs were older and dying they got fleas.

The vet told me that due to aging their bodies can't fight pests so I got flea pills for older pets and it did the trick right away. They are expensive though, but I would pay $1,000,000 to help my babies. I only needed two tablets and the fleas were gone. Well worth the price. I forget the name of the meds since I gave the left over pills to my mom for her dog. Any legitimate vet should know the pills though.