Horse Worming Schedule UK: Complete Year-Round Guide

Effective worming is one of the most important aspects of horse health management in the UK. The approach has changed significantly over the past decade — blanket rotation worming every six to eight weeks is now considered counterproductive by most equine vets. Targeted worming based on faecal egg counts is more effective, reduces drug resistance, and costs less.

Why Targeted Worming Matters

Anthelmintic resistance — where worm populations become resistant to commonly used drugs — is a growing problem in UK horse populations. Worming horses that do not have a significant worm burden contributes to resistance without benefit. The British Equine Veterinary Association and most equine vets now recommend testing before treating.

Faecal Egg Counts

A faecal egg count (FEC) measures strongyle egg output in grams of fresh droppings. Kits are available online for £15–20 and give results within a few days. The threshold for treatment in adult horses is generally 200 eggs per gram. Horses below this threshold in spring and autumn do not need worming for strongyles.

Seasonal Schedule

Spring (March–April): Carry out a FEC. Treat horses above 200 epg with Fenbendazole (Panacur) or Pyrantel (Strongid-P). Re-test 14 days post-treatment to check efficacy.

Early summer (May–June): Consider a tapeworm saliva test (EquiSal) or treat all horses with a Praziquantel-based wormer. Tapeworms are not detectable by standard FEC so either testing or routine treatment is needed.

Autumn (September–October): Repeat FEC. If the horse was at pasture all summer, consider a Moxidectin-based treatment for encysted small redworm larvae which are not counted by standard FEC.

Winter (December–January): All horses should receive a combined Moxidectin and Praziquantel treatment regardless of FEC results. Equest Pramox is the standard product for this — it targets encysted small redworm and tapeworm simultaneously. This is the one treatment most equine vets recommend universally.

Key Products

Equest Pramox for the winter dose. Panacur (Fenbendazole) or Strongid-P (Pyrantel) for spring and autumn if FEC indicates treatment. All available from online equine pharmacies with a valid horse passport number — no prescription required for most wormers.

Do not skip the winter Moxidectin and Praziquantel dose — encysted small redworm is the most dangerous parasite for UK horses and is invisible to standard egg counts. For all other treatments, test first and only treat horses that need it.