Ivermectin

Ivermectin based Wormers control parasites that are resistant to benzimidazole-based wormers. Worms can survive frost and snow so it is not difficult for horses to be re-infected even if they are only out for a short while. Used routinely throughout the winter months, Ivermectin based wormers will reduce the risk of infestation. It will give effectiveness against both larval and adult stages of the important parasites of horses, including small redworms. lvermectin based Wormers will also control bots when given as a single dose in the late autumn or early winter after the first frosts. 

Moxidectin

This chemical has the ability to kill encysted developing cyathostome larvae (small redworm) in a single dose. Moxidectin, suppresses egg reappearance and therefore leads to a long dosing interval for small redworm control. Moxidectin based Wormers are  also effective against large redworm, lung worms, pinworms, stomach worms and will also treat for bots when given used in early winter after the first frosts.

Pyrantel 

Pyrantel is effective against most adult roundworms. They need to be administered at twice the standard dose when being used for the treatment of tapeworm. If your horse is stabled on straw or other products where mites can survive then this double dose twice a year will ensure adequate control of tapeworm infestations. The Tapeworm lifecycle is 6 months so although treatment once a year (late September/early October) may well be adequate in some cases it is recommended that you do treat twice per year to break the cycle.

Praziquantel

Can be a very effective treatment for all three known species of equine tapeworm in a single dose. Products that contain Ivermectin as well as Praziquantel  can be used all year as they are also an effective treatment against bots and round worms. Products that contain only Praziquantel as the active ingredient give owners the option of treating for tape worm without also treating for roundworm thus helping to reduce the risk of equine anthelmintic resistance building up. Care should be taken with regard to encysted small redworm larvae where a treatment using a 5-day course of a fenbendazole-based product or a  Moxidectin based product should be considered.

Fenbendazole & Mebendazole

 These chemicals are not used so often these days as there is some resistance to them. they can be used as part of your worming programme before using make sure that your horse is infected with worms that are susceptible to it by taking a dung sample and having an egg count done.. By using a 5-day course  of a fenbendazole-based wormer  between Autumn and early spring small red worm encysted larvae acquired during the grazing season can be controlled. If an early dosage is administered this treatment can be repeated again in February to remove larvae acquired during the winter months. This will also help reduce the levels of infective larvae on the pasture the following spring.