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Dewormer Brochure
A comprehensive overview of the available treatment options from Zoetis that are used to target the right parasites at the right times.
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Quest® Plus Gel
Recommended for late grazing season (fall), Quest® Plus Gel is the only dewormer that treats small strongyles, including encysted forms, in a single dose with broad-spectrum support that also helps treat tapeworms.
How parasites affect your horse's health
Intestinal parasites can cause serious health problems in horses, including fever, diarrhea, colic and even death. Using the most effective product at the right time is essential to lower the risk of parasite diseases, prevent resistance to dewormers, and control the shedding of parasite eggs.
How parasites spread in horses
Horses ingest worms by grazing in contaminated pastures or by being exposed to infected horses.
Horses ingest larvae while grazing
Immature worm stages can migrate through tissues and organs.
Immature larvae eventually end up in the small and large intestines and mature into egg-laying adults.
Mature female worms produce eggs that are then passed in manure.
Eggs hatch and quickly develop into infective larvae.
Benefits of Quest® Plus Gel
Using an effective dewormer at the right time can help reduce parasitic resistance.1 Quest Plus Gel is the only equine dewormer that targets the most threatening parasites in a single dose. The primary active ingredient, moxidectin, is considered the parasite experts’ treatment of choice against small strongyles and is also effective against large strongyles (bloodworms), bots, pinworms, hairworms and stomach worms.1 Quest Plus Gel also includes a second active ingredient, praziquantel, which provides the expert-recommended late grazing season (fall) treatment against tapeworms, which may also present serious health threats to horses.2 Quest Plus Gel has been evaluated as safe for use in breeding and pregnant mares.
Recommended for the late grazing season (fall):* October to December
Targets adult and encysted small strongyles and tapeworms in a single dose
Gel formula dissolves quickly on the tongue
SURE-DIAL® syringe for accurate dosing
Treats up to 1,500 pounds
Safe for breeding and pregnant mares and breeding stallions
Safe for 6 months of age or older
*Based on your location in the United States
Effective broad-spectrum
treatment for late grazing season
With Quest Plus Gel you can help target the right parasites at the right time, during late grazing season (fall). For early grazing season (spring), learn more about our recommended dewormer Quest Gel.
Download the product comparison chart
| Product Name |  | Zimecterin®†, IverCare®†, Eqvalan®†, Duramectin®†, Bimectin®† | Zimecterin Gold®†, EquiMAX† | Safe-Guard®†, Panacur®† | Panacur®† POWERPAC |
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| Active ingredients | Moxidectin & Praziquantel | Ivermectin | Ivermectin & Praziquantel | Fenbendazole | 5-Day Double-Dose Fenbendazole | ||||
| Parasites | Most threatening to horses | Tapeworms |
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| Adult Small Strongyles |
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| Encysted Small Strongyle Larvae |
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| Adult Large Strongyles |
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| Migrating Large Strongyle Larvae |
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| Added coverage | Roundworms Most threatening to foals and young horses† |
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| Bots |
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| Pinworms |
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| Hairworms |
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| Stomach Worms |
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†Compared to labels of Zimecterin®, Zimecterin Gold®, Eqvalan®, IverCare®, Duramectin, Bimectin®, EquiMAX®, Safe-Guard®, and Panacur®.
*Per the 2024 American Association of Equine Practitioners’ Internal Parasite Control Guidelines, there is widespread roundworm (ascarid) resistance (lack of efficacy) to macrocyclic lactones (moxidectin and ivermectn). If macrocylic lactone resistance is suspected based on lack of clinical response, the 2024 American Association of Equine Practitioners Internal Parasite Guidelines recommends benzimdazoles (oxibendazole and fenbendazole) should be given.
**Per the 2024 American Association of Equine Practitioners’ Internal Parasite Control Guidelines, multiple studies show widespread small strongyle (cyathostomin) resistance (lack of efficacy) to benzimidazoles (fenbendazole and oxibendazole).
†American Association of Equine Practitioners. Internal parasite control guidelines. https://aaep.org/resource/internal-parasite-control-guidelines
Zimecterin, Zimecterin Gold, and Eqvalan are registered trademarks of Boehringer Ingelheim Animal Health, IverCare is a trademark of Farnam Companies Inc. Bimectin is a trademark of Bimeda Inc. EquiMAX is a trademark of Virbac. Safe-Guard is a trademark of Intervet Inc. or an affiliate. Panacur is a registered trademark of Merck Animal Health.
Find the right dewormer treatment plan.
The Zoetis product quiz will help you determine the effective product to use at the most appropriate time of year to help maintain your horse’s health.
Question 1
How to use Quest® Plus Gel
Treating your horse can be safe and effective by following the steps outlined in this short video.
Articles
Browse our collection of blog posts to learn how Quest Plus Gel and other Zoetis Equine products can help your horse receive the best care possible.
Helpful documents
Adult Deworming Guide
Our adult horse guide includes recommendations for broodmares along with low and high shedders.
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Foal Deworming Guide
Foals require special care in their first year of life. View our customized dewroming schedule to help plan for timely treatments.
View Document
Yearling Deworming Guide
Young horses are more susceptible to parasites. See our comprehensive guide to deworming 1-to 2 -year-old horses.
View Document
All About Deworming Poster
Hang this poster in your practice or share with clients to educate them on the importance of deworming, including when, where and why.
View Document
Product Comparison Chart
Refer to or print this poster to better understand the importance of deworming, including when, where, and why you should do it.
View Document
Related products
We provide the most comprehensive range of equine dewormers to treat the most dangerous parasites for each life stage without over-deworming.
Multiple Parasites
OTC
(moxidectin)
Recommended for early grazing season. The Quest Gel and Quest Plus Gel are the only dewormers that treat encysted small strongyles and bots in a single dose, with broad-spectrum support that also treats large strongyles (bloodworms), pinworms, hairworms and stomach worms. Easy gel formula dissolves on the tongue.
Roundworms in Foals
OTC
(oxibendazole)
Recommended for the essential treatment of roundworms (ascarids) in young foals at 2 to 3 months of age. Also effective against large strongyles (bloodworms) and pinworms in adult horses.
Roundworms in Foals
OTC
(pyrantel pamoate)
Recommended for the important treatment of roundworms (ascarids) in foals at 4 to 6 months of age and 1 month post-weaning. Also effective against large strongyles (bloodworms) and pinworms in adult horses.
IMPORTANT SAFETY INFORMATION
Consult your veterinarian for assistance in the diagnosis, treatment, and control of parasitism.
Quest Gel & Quest Plus Gel
Do not use Quest Gel or Quest Plus Gel in foals less than 6 months of age or in sick, debilitated and underweight horses. Do not use in other animal species, as severe adverse reactions, including fatalities in dogs, may result.
References
- American Association of Equine Practitioners. Internal Parasite Control Guidelines. https://aaep.org/resource/internal-parasite-control-guidelines/. Accessed June 24, 2024.
- Proudman CJ, French NP, and Trees AJ. Equine Veterinary Journal. 1998; 30(3):194-199.