I'm not certain but I feel I have just been ripped off by my vet (for a change :-) )  we have 2 litters of pups due to be wormed, normally I would buy my wormer from the net a 100ml bottle costing around £12..............as I had ran out we got it from our vet and she charged us £24!!!!  that seems heck of a lot.

What does your vets charge for Panacur 10% liquid????

That does seem a bit high - have you used any yet, if not take it back for a refund and buy it in the normal way.

Another thing you might consider which is even cheaper is to buy the 10% Cattle & Sheep panacur from an agricultural merchant as a 1L bottle is around £60

Same stuff you just need to have a copy of the amounts