
09/09/2025
🐴 Let’s Talk Moxidectin 🐴
Moxidectin is one of the most important worming tools we have for horses right now — but it’s also one we need to protect. Why? Because it’s currently the only active ingredient available that can target encysted small redworms (cyathostomes), which are some of the most dangerous parasites horses can carry.
👉 The risk? If moxidectin is used too often, worms can become resistant to it. And once resistance takes hold, we can’t turn back the clock — we lose that tool forever.
That’s why vets and parasitologists recommend keeping moxidectin as a “once-a-year” treatment, ideally in autumn, when the aim is to clear encysted redworm larvae before winter.
Overusing moxidectin (for example, using it every couple of months “just in case”) isn’t making your horse safer — it’s putting the whole horse community at risk by speeding up resistance.
✅ So what can you do?
• Use Faecal Egg Counts (FECs) through the year to check if worming is actually needed.
• Save moxidectin for when it’s really required: once a year in autumn.
• Rotate with other products only when testing shows they’re needed.
By using moxidectin wisely, we protect its effectiveness for the future — for our horses, and everyone else’s too.