Print page content Print
Increase text size Decrease text size
Text Size




Strongid C 2X

Keeping parasite levels under control helps your horse perform at his best. Parasites steal nutrition, energy and good health from your horse. Left unchecked, parasites can cause damage to vital organs, impair growth and performance, and may cause colic.

A daily dose of STRONGID® C 2X helps break the cycle of parasite infection. STRONGID C 2X helps prevent Strongylus vulgaris larval infestations and control adult large strongyles as well as adult and fourth-stage larvae (L4) of small strongyles, pinworms and ascarids.

Certain risk factors may call for daily deworming to help maintain health and peak performance:

  • Boarding and training barns
  • Movement on/off farm for training or competitions
  • High-risk age groups such as foals, weanlings and geriatric horses
  • High stocking densities (more than two horses per acre)
  • Nonrotated pastures
  • Continuous parasite exposure
  • Confirmed fecal egg count (FEC) of more than 200 eggs per gram

To identify your horse’s parasite exposure risk, work with your veterinarian to conduct an FEC test. Then evaluate your horse’s Individualized Deworming™ needs by answering a few questions on

For horses at higher risk of parasite exposure, STRONGID C 2X provides a safe, effective method to help reduce exposure to parasites.

Collapse All
  • SAFE

    • Foals may be administered STRONGID C 2X as soon as consistent intake of grain mix is occurring, generally between 2 and 3 months of age.
    • STRONGID C 2X may be used in mares at any stage of pregnancy or lactation. Daily use of STRONGID C 2X in the last 30 days of gestation is a safe, effective method of reducing foal exposure to parasites.
    • Stallion fertility is not affected by the use of STRONGID C 2X.


    • Effectively controls adult large strongyles and adult and fourth-stage larvae (L4) of small strongyles, pinworms and ascarids (roundworms).
    • STRONGID C 2X provided a high level of control for adult and fourth-stage ascarids with efficacies of up to 100%, confirmed by two separate field studies.1
    • Prevents Strongylus vulgaris larvae before they can damage vital organs or grow into adulthood and produce eggs that contaminate pastures.


    • Alfalfa and molasses-based pellets help ensure eager consumption and can be top dressed or mixed into any feed.
    • Concentrated STRONGID C 2X requires 2 ounces daily per 1,000-pound horse.
  • The most important tool in your parasite control arsenal is your veterinarian. If your veterinarian determines your horse would benefit from STRONGID C 2X, getting started is easy.

    First, if the horse has not been previously dewormed or may have an established a Strongylus vulgaris larval infestation, administer a broad-spectrum purge dewormer such as QUEST® PLUS Gel to treat your horse for existing parasites.* Then begin daily treatment with STRONGID C 2X. Next, work with your veterinarian to determine the ideal duration for daily treatment and frequency of purge deworming necessary based upon your horse’s individual parasite risk factors and unique Individualized Deworming needs.

    STRONGID C 2X is to be administered on a continuous basis either as a top dress or mixed in the horse’s daily grain ration at the rate of 1.2 mg pyrantel tartrate per pound of body weight daily. To achieve this dose, administer:

    • 0.5 ounce of STRONGID C 2X per 250 pounds of body weight.

      Horse Weight STRONGID® C 2X Daily Dose
      250 lb. 0.5 oz.
      500 lb. 1.0 oz.
      750 lb. 1.5 oz.
      1,000 lb. 2.0 oz.
      1,250 lb. 2.5 oz.
      1,500 lb. 3.0 oz.
    • Doses per package for a 1,000-pound horse:
      - 50-pound. bag = 400 daily doses
      - 10-pound with bucket = 80 daily doses

*Always carefully read and follow product directions.




Mon–Fri, 8:30am–6:30pm ET

This site is intended for U.S. Animal Healthcare Professionals. The product information provided in this site is intended only for residents of the United States. The products discussed herein may not have marketing authorization or may have different product labeling in different countries. The animal health information contained herein is provided for educational purposes only and is not intended to replace discussions with an animal healthcare professional. All decisions regarding the care of a veterinary patient must be made with an animal healthcare professional, considering the unique characteristics of the patient.

All trademarks are the property of Zoetis Services LLC or a related company or a licensor unless otherwise noted. ©2024 Zoetis Services LLC. All rights reserved.