Hi
The only way to get rid of the majority of worms is to use a rotational worming system. By taking into account the time of year and other factor, one uses the correct wormer that coincides with the parasites that are most prevalent -life cycles etc. play a factor, too-. I use Ivermectin, Fenbendazole, and Pyrantel Pamoate -there are various brand names for these types of wormers-. I would suggest doing a search on here to find a program that best suits your horse's particular needs -environment etc.-. Here's a great example of a good worming system with an explanation that I found on another site -there's a bit about Quest in it...DON'T USE QUEST ON MINIS!!!!!:
This is my BI-monthly worming plan based on a rotation of anthelmintic that is best used during each season. Each horse WILL be required to participate in this strategic plan.
January
February - Double Dose Fenbendazole for 5 consecutive days
March
April - Double Dose Pyrantel Pamoate
May
June - Ivermectin single dose
July
August - Ivermectin single dose
September
October - Double Dose Fenbendazole for 5 consecutive days
November
December - Ivermectin single dose
Explination:
Ivermectin should be used through out the entire grazing season.
Pyrantel Pamoate's should be used early spring and late fall
Ivermectin should be used late winter when contracting 'grazing season' worms is limited if at all, this eliminates any residual summer worms and is most effective as they are not likely to be ingested again until spring.
Worming for encysted Redworms also known as Strongyles is THE most important worm to eliminate. This is accomplished with a five-day course of Fenbendazole administered at a double dose. The reason you have to administer so much wormer for this specific worm is because it has a very slow metabolism, and a single dose simply doesn't phase it. The wormer only stays in the horses system for about 16 hours and the worm's lives on. But even if you were to give just a double dose in one go, these worms have the ability to ''insist'' themselves into our horses which makes the pretty much invincible. Doing this 5 days in a row, is the only known way to rid the body of up to 90+% of strongyles. It WILL NOT hurt your horse, Safeguard is an amazing product and the name directly effects its potency, its SAFE! Why are Strongyles so bad? Because they most common and most destructive of all-internal parasites in the equine!
Quest is by far the most controversial equine wormer available to us horse persons!
Quest is absorbed into the fat cells of your horse. Making it a fat-soluble wormer (this is why you do NOT worm foals with this product). Therefore it is stored in your horse’s fat cells and released slowly into your horses system. Thus extending the length of time between wormers. Generally you do NOT worm for at least 3 months after using the product.
Now because it is a fat-soluble wormer (gel), it is also absorbed into brain tissue. This can cause your horse to become uncoordinated among other signs of nervous system toxicity. This may also effect the horse with out you physically able to see it. An overdose would produce noticeable side effects, seizures/comma/death being only the most serious of many.
Other problems with this wormer are the fact that it is possibly ‘to good a wormer’, meaning it is so effective in a single dose that horses that are debilitated or carrying heavy worm burdens could quite easily become impacted/colic due to the large die off of worms in their bodies.
The worst equine worm horse owners need to worry about is encysted strongyles. The hype is that Quest does a good job at killing encysted strongyles (among many others). Although yes it does a decent job because it sticks around in the body for a substantial amount of time – it is not as effective as a double dose of fenbendazole for 5 consecutive days in a row. Either way there are other options to remove encysted strongyles without using Quest.
So, we do have a very effective and safe alternative to quest in regards to eliminating Redworms or Strongyles, which ever you prefer to call them. Ivermectin is more effective then quest in eliminating bots, and our Pyrantel pamoate’s do a great job eliminating tapes. Quest does not need to be incorporated in a routine worming plan at all, but it as all personal choice and preference.
I personally will never incorporate the product into my worming plan as I cannot for the life of me understand why if you have other safer options, you would take the risk. Quest can be potentially hazardous at a mere 5x the recommend dose. That is VERY low, especially when you compare it to all the other wormers we have on the market. Ivermectin can be administered at 60x the dose and still not cause serious problems, fenbendazole at 100-200 times the dose and studies have shown that even then there wasn’t any signs of problems. My point is I am not about to use a product that is potentially lethal at such an incredibly low overdose. It simply has more toxicity in our horse’s bodies
Hope that helps!!