Depends on which worms were present. If this is a foal, and it has a large strongyle infestation, which is common in foals, btw, then you may well see big nasty flat white things (in one case hanging form the ceiling, no, really, and mercifully dead!!!) in the droppings.
The five day course gets encysted small strongyles as well- it is the only safe way of killing these nasty things- but it does not get a whole lot else. You need to wait ten days and then worm with a full dose for weight of Ivermectin, if you really think your horse is wormy. I would also, at that time, use a tape worm killer- Praziquantel is best and it comes in a duo pack with Ivermectin- after that lot you should have a fairly squeaky clean horse, internally, at least.
I do not like to "prescribe" dosages as I am not a Vet but the directions on the box are quite clear, if you know your horses weight you can work it out easily!what time of year should we do the five day course ?
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