Worms and Horses Part 3: Herbal Deworming & Environmental Control

The following post is co-authored by Ellen Collinson and Alex Wilson.  This is part three of a series on horses and worms.  The article can be viewed in its entirety on Ellen’s website


Herbal Worming

The use of herbal remedies or herbal medicines is thought of today as alternative, but if we examine the evidence, in reality it is the chemical products that should be termed as alternative. Herbal medicine can be traced much further back than any modern chemical treatment. In fact, a large number of medicines used today have their basis in herbal remedies that can be traced from as far as the tribesmen of Africa, the ancient Egyptians and the Chinese.

The first reports of herbal medicine can be dated as far back as 2800 BC in ancient China. By 400 BC the Greeks had also adopted the use of herbal medicines and by 100 BC the first reference book on herbs was written in Greece. By 50 AD, herbal medicine had spread to the Roman Empire and by 500 AD herbal medicine first came to Britain and was practised throughout Saxon times. By 800 AD, herbs were being grown in monasteries in Britain and monks developed the usage of these remedies.

At the time of the black death herbal remedies were used to try and contain the spread of the disease. In the 1500s, and during the reign of Henry Tudor, the first laws were passed to control the practise of herbal medicine to stop them being supplied by untrained apothecaries. In the 1600s, medicine in Britain was becoming two-tier, chemical based drugs for the rich and herbs for the poor. During this period and into the 1700s, many conventional drugs were being sold over the counter, but the realisation of the terrible side effects was starting to become a reality. As we move into the modern era, there has been a large resurgence of herbal medicine, partially due to the side effects of chemical products, but also as in many cases natural products are in harmony with nature, so can be more effective.

There are many products on the market claiming to be herbal parasite repellents that will have little if any effect, so it is always worth investigating what research has been conducted to back up their claims.

There are herbs that are classed as Anthelmintics: these are herbs which have the capacity to destroy intestinal worms and parasites. They come in two categories: vermicides and vermifuges. The former are agents that destroy worms without necessarily causing their expulsion from the bowels and this category of herbs should be combined with laxative or cathartic herbs which then cause the expulsion of the destroyed parasites. Vermifuges are agents, usually having cathartic properties, which expel worms from the bowels.

As well as Anthelmintics there are Taeniafuges and Taeniacides. These are herbs that expel (taeniafuges) or kill (taeniacides) tapeworms in the intestinal tract.

For a product to have a good combination, it must include these herbs and also a separate cathartic; this helps not only to loosen the bowels and work as a laxative but to clean the gut walls of the eggs and larvae. Also needed is a good demulcent: demulcent herbs act as a soothing agent to calm any inflamed or damaged tissue, and also to prevent any ‘side effects’ that a strong anthelmintic, especially chemical anthelmintics, can cause. And last, but not least, it would contain a stimulant to prompt the herbs to work as a formulation.

As many anthelmintic herbs are very bitter and cathartics very strong, it is usually a good practice to add a herb that has both a palatable flavour as well as a pleasant aroma; this can be the chosen stimulant or demulcent.

Through in vivo trials conducted at the Institute of Organic Research in Switzerland, it has been proven that certain herbs show a significant activity with a 79% reduction in egg output on day five of feeding it and a 100% cessation of egg hatch. The trials also show that the anthelmintic activity either killed or paralysed the larvae so they cannot climb up the grass to be eaten by a new host. This stops the cycle and also prevents the build up of resistance.

It has also been proven in recent trials conducted in the wild, that herbal parasite repellents do not cause any damage to wildlife, the water or the environment.

It is however, essential that before buying a herbal parasite repellent, you check that it has been properly trialled, and that the results prove that it can be used as either a complete wormer or as part of a worming programme.


Environmental Control of Parasites


Controlling parasites on a property can go beyond a good worming programme and the following ideas can certainly help control parasites.

Any new horses arriving, before they are allowed to graze with the other horses, should be isolated for 48 hours and wormed. It is important to know what worming has been done at the property the horse is coming from and if any infestation is known to be a problem there. Even if you are informed that the horse is worm free; do not take that information as gospel and conduct your own worming. Herbal parasite repellents are often good for this situation as you can be confident of not overdosing a horse or giving them a product that might conflict with what they might have been given recently.

During the 48 hour period make sure that all droppings are removed and either have the dung removed from the property or use it as a garden fertiliser so that it is kept away from other horses.

A general consideration is to make sure that paddocks are kept as free from droppings as possible and that will help stop the parasites’ life cycles. Many yards and stud farms use special paddock vacuum cleaners to remove droppings. Again make sure that dropping are disposed of and do not get back in direct contact with horses. Faecal egg counts can also be a very useful tool, and consider the fact that if you have a horse with a large worm burden it is advisable to isolate it from the rest of the herd.



The subject of equine parasites and their control is very complex and a proper understanding of the subject, leading to good worming practice, should maintain clean pastures and healthy horses. It is very easy to fall into the trap of either performing the same worming time in time out or performing a targeted rotation, but these are not necessarily the answers unless the horseman is aware of particular worms that may be affecting their property. The use of herbal parasite repellents should also be considered for good practice as the way that they work, being very different from the chemical approach, breaks the life cycle of equine parasites.



Natural Healthy Horse Care – RH Kerrigan B.Sc, MAIAS, MAAC. (Equine Educational) Parasite Cycle– www.dignosteq.com Should Horses be Wormed– www.soloequestrian.com Equine Internal Parasites – Don Hudson, Dale Grotelelueschen, Duane Rice Natural Horse Wormers – www.successful- natural-horsecare.com Illustrated Veterinary Encyclopaedia for Horsemen (Equine Research Inc.) Bad Bug Basics Karen Biggs DVM, Craig ReinemeyerDVM PhD, Dennis French DVM, MS, DipL, ABVP and Ray Kaplan DVM, PhD (The Horse Magazine) Resistance Worms, do your horses have them? Karen Biggs DVM, Craig ReinemeyerDVM PhD, Dennis French DVM, MS, DipL, ABVP and Ray Kaplan DVM, PhD (The Horse Magazine) Deworming adjuncts – Karen Biggs DVM, Craig ReinemeyerDVM PhD, Dennis French DVM, MS, DipL, ABVP and Ray Kaplan DVM, PhD (The Horse Magazine) Age-related parasites – Karen Biggs DVM, Craig ReinemeyerDVM PhD, Dennis French DVM, MS, DipL, ABVP and Ray Kaplan DVM, PhD (The Horse Magazine) Control for mature horses Karen Biggs DVM, Craig ReinemeyerDVM PhD, Dennis French DVM, MS, DipL, ABVP and Ray Kaplan DVM, PhD (The Horse Magazine) Environment; development and persistence of parasites – Karen Biggs DVM, Craig ReinemeyerDVM PhD, Dennis French DVM, MS, DipL, ABVP and Ray Kaplan DVM, PhD (The Horse Magazine) Bots and beyond- Karen Biggs DVM, Craig ReinemeyerDVM PhD, Dennis French DVM, MS, DipL, ABVP and Ray Kaplan DVM, PhD (The Horse Magazine) Tapeworms, an underrated threat Karen Biggs DVM, Craig ReinemeyerDVM PhD, Dennis French DVM, MS, DipL, ABVP and Ray Kaplan DVM, PhD (The Horse Magazine) Strongyles, the worst of the worms – Karen Biggs DVM, Craig ReinemeyerDVM PhD, Dennis French DVM, MS, DipL, ABVP and Ray Kaplan DVM, PhD (The Horse Magazine) The History of Herbal Medicine – www.herbal-concepts.co.uk Investigation of anthelmintic resistance and deworming regimens in horses – M Blanek, HA Brady, WT Nichols, DP Hutcheson et al. Historical perspective of cyathostomes; prevalence, treatment and control programs ET Lyons, SC Tolliver and JH Drudge. Department of veterinary science Gluck Research Centre, University of Kentucky.


Hi! My name is Casie Bazay. I'm a mom, a freelance writer, and a certified equine acupressure practitioner.

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3 Responses

  1. Clissa says:

    Worming has become a big issue at my place. Not only because of the possibility of NTW, but also because of the knowledge gained from getting a faecal egg count done.
    It was an eye opener to me because I was confident I had been doing it right.

    About the time I had the FEC I also got a soil test on the paddocks & got a nasty surprise there too.
    Because, as part of my worm reduction program I was removing the manure from the paddocks, I was also removing the fertility. That was clearly evident in the soil test. Actually I got the soil test because I noticed a dramatic decline on soil fertility & therefore grass density & quality.

    So I was advised to leave the manure to help build humus, biology, earthworms, dung beetle numbers, etc. Then the FEC came back & one horse was a host.

    So a double whammy. I did a triple worming to clear the horses of worms (which also helped for the NTW) & changed my paddock rotation by resting some paddocks long term. But worst of all I had to stop picking the manure except close to feed areas where horses rested & gates where I just hate seeing it build up. All that manure goes into the garden compost. When I worm I have a special little paddock they spend a few days in to deposit that manure & I can check for results.

    Just recently I did my normal end of winter worming & got a huge kill of small strongyles, so 16days later I did a follow-up worming to hopefully get the previously encysted & now freshly hatched worms. There were none to be seen in the manure but I’m hopeful they were there.

    So although the horses must be picking up more worms now that the manure is left in the paddocks, perhaps I am getting a better kill when I worm.
    I will have to resort to FEC’s I think, for best results.

  2. Clissa says:

    Here’s a thought!
    Perhaps I should use a herbal wormer as part of my worming cycle?
    What brand to use? That is the burning question.
    Just what is allowed in Australia or more to the point what has been tested here.

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