Horse dewormers fall into a few main groups. Each works on different parasites and has different risks.
Macrocyclic Lactones
Examples: Ivermectin, Moxidectin
These are common dewormers in the U.S. They treat many strongyles and bots.
Some parasites are becoming resistant. Moxidectin lasts longer but needs careful dosing, especially in young or thin horses.
Benzimidazoles
Examples: Fenbendazole, Oxibendazole
These drugs once worked well. Today, many parasites resist them.
Vets may still use them in special cases.
Pyrimidines
Examples: Pyrantel pamoate, Pyrantel tartrate
These drugs treat some roundworms and strongyles.
Resistance can develop if used too often or without testing.
Praziquantel (Tapeworm Treatment)
Praziquantel targets tapeworms. Most dewormers do not kill tapeworms alone.
It is often mixed with other drugs.
Herbal and Natural Dewormers
Herbal products use plant extracts or oils. Some may support gut health.
There is little proof they control parasites on their own. They should not replace proven treatments.
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