Mounds Pet store sells a "pill giver" for $1.95. Shaped like a syringe with little pill grippers on one end and a plunger on the other. Wrap the cat in a towel, firmly grasp the back of their head, gently place the pill gripper in their mouth and push on the plunger. It pushes the pill far enough down the throat to force swallowing. No foaming and once the cat has shaken off the experience, she was good to go. Sounds impossible, but worked well with myself and my husband and our cat Bushes.
Good luck!