Zemectin/ivermectin Worms Are Surviving?

Ivermectin's never been anywhere near 100% against pinworms. The problem is, the female lays the eggs outside the body, so when the ivermectin's delivered they don't get killed. Multiple doses help, but do not cure.

You have to use a wormer with a residual effect, which ivermectin doesn't have. That's why ivermectin doesn't build immunity in parasites - it doesn't hang around in subclinical doses to acclimate the little buggers.

Second hand info... the kid says the doc says... I question it. Something was probably misstated or misunderstood.

Immunity to dewormers is not new - althout Ivermectin has been the most successful by far.

You should ALWAYS rotate at least 2-4 times a year to prevent immunity.

Be sure that the dewormer you are using actually kills the worm you are trying to remove. Doing fecal counts 1-2 times a year will help you to know what worms you need to target.

Also, be sure your horse is actually getting his dewormer. Is she doing it herself or depending on someone else to do it? Horses are VERY good at not truly eating their dewormer. Take the time to do it right and be sure your horse is getting the full dose.

Panacur Power Pacs will kill just about anything so that should give you a clean slate. Then start a more aggressive rotation program and have the fecal counts done regularly.

Hope This Helps!

Yes i have seen this. A local vet told me a few years ago that the best way to worm is give generic pyrantel pamoate or generic ivermectin the first day, 2 days later give the other, in 2 more days give them Quest. I started using Zimectrin Gold in place of the Quest every other cycle last year. I do this 3 times a year and have no worm problems and some of my friends went to this method and it solved their problems also. Good Luck

not familiar with the power pac. have heard of the immunity problem. You should always use alternate wormers in a consistent rotation. this usually solves the problem. I live in an area of heavy probable infestation because of the weather so I worm every 6 weeks. I use an ivermectin product and especially in the transitional season, my alternate is a product called Tapecare which is one syringe equivalent to a double Strongid. I learned this information at a horse care clinic given by an equine vet. Seems to work great.

I use a rotation schedule prescribed by my vet. I think I used strongid in May, now this month is an ivermec product. I think...I'd have to check to be sure.

I did have a horse with encysted strongyles and the double dose panacur did WONDERS for him.

But here's a money saver for her...just get enough LIQUID panacur from the vet to give a double dose for 5 days...for my gelding, it was 40 cc per day. MUCH cheaper, and the results are the same. I think panacur standard dose is 1cc/50 lbs? That works out right...20 cc for a 1000 lb horse, doubled would be 40cc (Sorry...doing the math)

I took a 60 cc syringe with the catheter tip, placed my finger over the end, filled it up to 40, placed the plunger over the end to seal, flipped it over and squeezed the air out, then popped it as far back in the mouth as possible. Not difficult at all.

Oh and for the shithead thumbs downer...this was done upon advice of the equine specialist for whom I work on prn basis, not something I pulled out of my ***. The reason the power pac or the double dose method works is it disrupts the cycle for several days, thus, several stages of the cycle. It is repeated over a period of several days. Panacur has no lethal dosage, so it is very very safe to give, even to puppies.

Duh

Actually, according to the lastest study data both roundworms and small strongyles are developing an immunity against most all of the comercialy available de-worming products on the market, and at this point no new products are forth coming.

Their study showed that there was no drop in fecal egg count of roundworms after treatment with Ivermectin or Pyrantel Pamoate. On the other hand, only Ivermectin reduced the number of Small Strongyle eggs, Fenbendazole, Oxibendazole or Pyrantel Pamoate showed no effect.

You might find these links helpful:

http://www.horsetalk.co.nz/news/2008/04/117.shtml

http://www.thehorse.com/ViewArticle.aspx?ID=12105

http://www.hearnvetservices.com/Worm.htm

it is not uncommon for worms to work up an immunity.i dont know about panacur because i havent used it but i rotate between ivermectin,oxybendazole,moxydectin and pyrantel pamoate and havent had a severe case where i needed it.i do use fenbendazole which is the active ingredient in panacur for my cattle.sounds like good advice from the vet.

I just got the email today. Roundworm has become resistent to both ivermectin and pyrantel. Fenbutazole and oxibenzadole are still effective against roundworm.

Ivermectin is still effective against small strongyles, but the populations are returning at a more rapid rate and they don't know why yet. The other paraciticides I mentioned above are not effective against small strongyles.

There is nothing in the working to kill these larvae/worms if they become completely resistent.

Ivermectin is only good for things like bots. You have to find something else for pin worms, not quick sure what off the top of my head. The Panacur Power Pac is really expensive if I remember correctly and I would just find the right wormer for your horse. You can also use Listerine (the human mouth wash) and rub it in their tales and then wash it out. Good luck!

I have never thought Ivermectin did good with pinworms anyway. The Panacur Power Pac will definitely kill them off.

The wormers are loosing there potency against some parasites - mostly do to people not rotating wormers, and people using them too often.

Just like antibiotics.