Ouch!
I read a top tip for tablets which works for me - my cat was a horror for spitting them out even with the gadget.
Anyway, I lay him on his back on my thighs, open his jaws and drop tablet it. Clamp mouth shut and before he knows what's happening he's swallowed it.
If he's very wriggly or has sussed what I'm about to do I wrap him in a towel first.