Quest® Gel

Recommended for early grazing season (spring). Quest® Gel treats against the most common equine parasites in a single dose.


Benefits of Quest® Gel

Using the right dewormer, at the right time helps reduce parasitic resistance.1 Quest Gel is recommended in the early grazing season (spring). Experts agree that moxidectin, the active ingredient in Quest Gel is the treatment of choice at treating small stronglyes (including in encysted larval stages)1, the primary parasite of concern in horses over 9 months of age.

Quest Gel has been evaluated as safe for use in breeding and pregnant mares, as well as in breeding stallions.

1 dose
Gel formula dissolves quickly on the tongue
SURE-DIAL syringe for accurate dosing
Treats up to 1,500 pounds

Effective broad-spectrum
treatment for early grazing season

In studies, moxidectin was significantly more effective than fenbendazole, the active ingredient in Panacur® POWERPAC at treating encysted small strongyle larvae.1 Moxidectin is also effective against large strongyles (bloodworms), bots, pinworms, hairworms and stomach worms. For late grazing season, learn more about our recommended dewormer Quest Plus Gel which also helps protect against tapeworms.1

Product Name Quest GelZimecterin®†,
Zimecterin Gold®†,
Active ingredients MoxidectinIvermectinIvermectin & PraziquantelFenbendazole5-Day Double-Dose Fenbendazole
Parasites Most threatening to horses Adult Small Strongyles
Encysted Small Strongyle Larvae
Adult Large Strongyles
Migrating Large Strongyle Larvae
Added coverage Bots
Stomach Worms

†Compared to labels of Zimecterin®, Zimecterin Gold®, Eqvalan®, IverCare®, Duramectin, Bimectin®, EquiMAX®, Safe-Guard®, and Panacur®.
*Per the 2019 American Association of Equine Practitioners’ Internal Parasite Control Guidelines, there is widespread roundworm (ascarid) resistance (lack of efficacy) to macrocyclic lactones (moxidectin and ivermectin).
**Per the 2019 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).

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.

How to use Quest® Gel

Treating your horse can be safe and effective by following the steps outlined in this short video.

Additional resources

Use our collection of resources to learn how Quest Plus Gel and other Zoetis Equine products can help your horse receive the best care possible.

Find the right dewormer treatment plan

The Zoetis product finder will help you determine the effective product to use at the most appropriate time of year to help maintain your horse’s health.

Related products

We provide the most comprehensive range of equine dewormers to treat the most dangerous parasites for your horse’s life stages without over-deworming. 

Multiple Parasites


Quest® Plus Gel 


Recommended for the end of grazing season. The only dewormer that treats encysted small strongyles, bots and tapeworms 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


Strongid® Paste

(pyrantel pamoate)

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


Anthelcide® EQ Paste


Recommended for the important treatment of roundworms (ascarids) in foals at 4 to 6 months of age and 1 month post-weaning.


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. Consult your veterinarian for assistance in the diagnosis, treatment, and control of parasitism.


  1. American Association of Equine Practitioners. Internal Parasite Control Guidelines. Accessed December 2022.