Both my horses went really quiet and came back with funny blood tests. Vets first reaction was encysted redworm, but without a stomach tap or bowel biopsy I will never know (both tests carried more risk than a few weeks off!).
However all I can say is the one I treated is back to his cheeky self and the other was still quiet and now on day 4 of the panacur guard treatment.
It will also perk up the immune system generally, so good so horses that go downhill between seasons.
Also worth noting that encysted redworm will not show up in worm counts, so although I thought mine were 100% worm free, this may not be the case.
The thing is with Panacur is that the active ingredient has been shown to be the one that worms have the most resistance to in this country so in actual fact if you live in an area with fenbendazole resistance you are pouring your money down the drain worming with it. Equest and Equest Pramox are better than Panacur for encysted worms as they have less resistance and treat all stages of the encysted larvae.
Personally I would only use Panacur gaurd for horses with a high worm burden, or those that carry a high encysted worm load as dosing with one sweep of equest would lead to mass death of the encysted worm which may cause colic, where as the 5 day course would lead to a milder response which would be easier on the horse's digestive system.
My usual worming regime would include Equest around November/December to combat encysted redworms and bots, Pyrantal for tapeworm in autumn and spring and then do worm counts throughout the year to check the worm burden of the horse and only worm when needed. Resistance to anthelmintics is a serious issue and their use should be limited so they remain effective when necessary, which is why I am surprised by my YO's strategy.
Edit to say: Panacur Gaurd for pregnant mares, young foals or old and convalecsing horses is also useful due to it being slightly easier on the gut.
Unless I had a horse in poor condition with a high worm count that required a gentle worming, I prefer to use equest - nice and simple in one dose and gets rid of everything but tape.
I use it once a year in January for bots and encysted red worm, then worm count plus a tape wormer in September - this routine works very well for my two and they are clear from worms.
We use it every year on all the broodmares and youngstock, we haven't found anything as effective to be honest. We also use a tapeworm wormer and the likes of equest on the older horses.
Our routine that seems to work best is once a year with PG, twice a year with strongid or similar and once more with equest or it's equivalent.
Some of the horses like the 34 year old mini shetland get done less as they appear to have built up their own resistance to worms over the years. Worm counts get done every so often too as it's the only real way to check what works.
I use it on the old boy because of its slightly gentler action. He has terrible reactions to chemical wormers and the 5 day does seem to be a lot more kind to his system.
I would certainly use it on a new horse or one with an unknown history as a matter of course but I know a lot depends on resistance in certain areas so it would depend a lot on where I was and where the horse had come from.
wouldn't use it on dan - use equest - dont think panacur is very effective, hence my only use would be for a horse wth unknown worming history and i would then follow up with equest after.
Used it this year as part of annual worming programme as read somewhere that only this and Equest do the particular job and I like the way to put the wormer in the feed - a bit surprised to see that many here seem to just use one or two products to worm in general where I thought you need to rotate the active ingredient on an annual basis ?!?