I use Drontal for mine but because of their weight, used to have to give one and a half - the first one was easy, second one thye knew you were coming
Drontal now do a single tablet for up to 6kg, I think.
Milbemax does up to 6 or 8kg so you only need one pill and it's much smaller than Drontal. Not sure how palatable it is - ours are fine to give pills to.
You can get spot-on wormer now - don't know the name though.