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Worming Your Horse 


For winter stabled horses:

Year 1 Strongid P every 4-6 weeks from March with a double dose of the same in September for tapeworm control and finishing with a single dose of Equest in November .

Year 2 Equest every 13 weeks starting in March , and with Equimax or Equitape for the September tapewormer and finishing in November with Equest again.

If outwintered at pasture then there is a theoretical requirement for another treatment against tapeworms in march with either double dose strongid p or equimax

……..and if you want to know why we suggest this regime………………

Parasitic worms live in the intestines of horses and ponies. Small numbers of worms can be tolerated, causing no effect on well being. Larger worm burdens can cause a range of problems including ill thrift, diarrhoea, colic and death. The immune response to worms is better in some horses and ponies than others and, as such, some are more susceptible to worm infestation. Pasture management and drug administration assist the horse’s immune system in keeping the intestinal population of worms under control. No one wormer will kill all horse parasites, so we suggest that you use the following regime to keep worms at bay and to avoid resistance build-up.


Worm from 4-weeks old every 4-6 weeks until 8 months old, and then follow the adult regime. Use Strongid Paste.



Routine worming – The frequency of worming depends on the type of wormer used and for horses and ponies stabled over the winter period should start in March.

There are two main classes of drug useful as routine wormers:

1      The Ivermectins - Equest / Eqvalan/ Equimax
2 The Pyrantel drug        - Strongid P

It is recommended that one class of drug should be routinely used for one year and then the other used during the next year to help discourage resistance developing in the worm population. So, stick with an Ivermectin wormer one year then a Pyrantel one the next year.

Dosing frequency:

  • Equest – every 13 weeks [the cheapest costing wormer on a per week basis]
  • Other Ivermectins – every 8-10 weeks
  • Strongid P - every 4-6 weeks

Underdosing for weight and incorrect frequency of dosing are the commonest mistakes made by owners


  1. Treat for tapeworms in September – either use a DOUBLE DOSE of Strongid P or normal dose Equitape . Equimax can also be used (as this ivermectin-based wormer also has a tapeworm treatment included).
  2. In November, it is wise to use a wormer which has activity against encysted over-wintering worms in the bowel wall that hatch out in spring to cause acute diarrhoea. Equest is recommended for this worming and has the added advantage of removing Bot Fly larvae as well.

After the November wormer, if your horse is wintered in the stable, it cannot pick worms up and worming restarts in March. If over-wintered at pasture, worming should be continued with a routine wormer at a frequency according to the wormer being used as above. If over wintered at pasture it may be wise to re-treat for encysted worms with Equest in February and for tapeworms again in March [Equimax].


Pasture hygiene is vital in controlling worm burdens:

* Remove droppings, ideally daily  * Do not overgraze/overstock * Rotate and rest paddocks

horse worming

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