Strategy-T Broad Spectrum Horse Wormer Paste by Virbac

Strategy-T by Virbac — a broad-spectrum combination horse wormer paste with a unique two-active formulation that's a critical part of any sensible worm-rotation program. The benzimidazole + tetrahydropyrimidine pairing makes Strategy-T the natural alternate-rotation partner to ivermectin-based wormers like Equimax. Ships USA, Canada and worldwide — no vet prescription required.

The rotation partner every well-managed worming program needs

Strategy-T contains oxfendazole (a benzimidazole) and pyrantel embonate (a tetrahydropyrimidine) — two different drug classes working together against equine worms. This combination is specifically designed to be used in rotation with macrocyclic-lactone wormers (Equimax, Equimax Elevation, Equimax LV, Ultimum) to slow the development of parasite resistance, which is now widespread on properties that rely on ivermectin alone.

The synergistic combination also catches some parasite life-stages that single-active wormers miss — particularly luminal small strongyles and the ascarid (roundworm) populations that have started developing resistance to ivermectin in some regions.

What Strategy-T kills

• Large strongyles (adult stages)
• Small strongyles / cyathostomins (adult stages, including some ivermectin-resistant populations)
• Roundworms (Parascaris equorum) — important coverage given ivermectin resistance in ascarids
• Pinworms (Oxyuris equi)
• Stomach worms (Habronema species)
• Tapeworms (Anoplocephala perfoliata) — pyrantel covers the most common equine tapeworm

What Strategy-T doesn't cover

Strategy-T does not kill bots (Gastrophilus species). For bot coverage, alternate with a macrocyclic-lactone wormer like Equimax or Ultimum at the autumn worming after bot fly season has ended.

Active ingredients

Each gram of Strategy-T contains 30 mg oxfendazole and 57 mg pyrantel embonate. One 35 ml syringe doses a horse up to 700 kg (1,540 lbs).

How to give Strategy-T

• Estimate your horse's weight using a weight tape or scale
• Set the dose ring on the syringe to the appropriate weight mark
• Make sure the mouth is empty of feed
• Insert the syringe at the back of the tongue and depress the plunger
• Raise the head briefly so the paste is swallowed rather than spat out

Why Strategy-T belongs in your worming program

• Different drug classes to ivermectin and moxidectin — the only way to slow resistance build-up
• Two synergistic actives — catches some worms that single-active wormers miss
• Effective against ivermectin-resistant ascarids in foals and yearlings
• Tapeworm cover in the rotation pyrantel cycle
• From Virbac, alongside Equimax and Ultimum as a complete rotation toolkit

Pairs with

• Equimax / Equimax Elevation / Equimax LV — alternate with these for the bot-coverage rotation
• Ultimum — alternate for the long-acting moxidectin rotation
• Browse the full horse wormer range for the rest of the equine range

Worldwide shipping — no prescription required

We ship Strategy-T to the USA, Canada, UK, Europe and worldwide. No vet prescription needed. International tracking included on every order.

Frequently Asked Questions

Q: Is Strategy-T the same as Equimax?

A: No — they're different products from the same manufacturer (Virbac), with different active ingredients. Equimax contains ivermectin and praziquantel; Strategy-T contains oxfendazole and pyrantel embonate. They're designed to be used in rotation, not as substitutes for each other.

Q: Does Strategy-T kill bots?

A: No. Strategy-T does not have any active that kills Gastrophilus (bot) larvae. For bot coverage, alternate Strategy-T with an ivermectin or moxidectin-based wormer like Equimax or Ultimum, particularly at the autumn worming.

Q: How often should I worm my horse?

A: Most vets recommend worming adult horses every 8–12 weeks, rotating between drug classes (e.g. Equimax → Strategy-T → Ultimum) to slow the build-up of parasite resistance. Foals are wormed more often (every 4–6 weeks) and pregnant mares should be dosed 4–6 weeks before foaling. Faecal egg counts every 6 months are the most accurate way to fine-tune your worming schedule.

Q: How do I dose by weight?

A: Estimate your horse's weight using a weight tape, a livestock scale, or the bodyweight formula (girth² × length ÷ 11,990). Set the plunger of the syringe to the corresponding weight mark, place the syringe at the back of the tongue and depress. Hold the horse's head up for a few seconds to make sure the paste is swallowed.

Q: Can I worm my pregnant mare?

A: Yes — all the products in this range are safe in pregnant mares when used at label dose. The standard recommendation is to worm 4–6 weeks before foaling, especially with a praziquantel-containing product (Equimax, Equimax Elevation, Equimax LV or Ultimum) to clear tapeworm before delivery.

Q: Why should I rotate between wormers?

A: Equine worms — especially small strongyles (cyathostomins) — develop resistance to single-class wormers when they're used continuously. Rotating between three or more drug classes makes resistance much slower to develop. The textbook rotation is: a macrocyclic lactone (Equimax/Equimax Elevation/Equimax LV/Ultimum) → a benzimidazole + tetrahydropyrimidine (Strategy-T) → back to a macrocyclic lactone. Faecal egg count testing helps you confirm your rotation is still effective.

Q: Are these wormers safe for foals?

A: Equimax Elevation is specifically formulated for foals from 2 weeks of age. Equimax and Equimax LV are safe in foals from 2 weeks of age at the correct dose. Strategy-T and Ultimum are for horses over 4 weeks of age. Always check the label dose for very young foals.

Q: Do I need a prescription?

A: No. All Virbac horse wormers in this range are sold over the counter — no vet prescription required. We ship to the USA, Canada, UK, Europe and worldwide.