Eprinex® (eprinomectin) – Deadly effective pour-on dewormer for internal and external parasite control.

Advance Deworming

As parasites evolve, so has deworming. It’s not enough to focus on production goals — although that’s important. Now we must develop a system that will be sustainable for the generations that follow. That means using the right products at the right time for the right reasons. And it starts right here.

Reducing Parasite Resistance to Dewormers

Douglas Ensley, DVM, Boehringer Ingelheim, talks about the history of deworming products and how to use them responsibly in order to reduce parasite resistance.

Product Description

EPRINEX Pour-On is indicated for the treatment and control of gastrointestinal roundworms (including inhibited Ostertagia ostertagi), lungworms, grubs, sucking and biting lice, chorioptic and sarcoptic mange mites, and horn flies in beef and dairy cattle of all ages, including lactating dairy cattle.
Visit EPRINEX.com to learn more.

Features and Benefits

  • Convenient for processing cattle on arrival.
  • Nonflammable, weatherproof formula works even on long, wet hair coats.
  • No milk withholding or meat withdrawal.
  • Only product that controls both Psoroptes and Sarcoptes mange mites as well as lice and horn flies.
  • Safe for pregnant, lactating and dry cows; calves* and heifers; steers and bulls.

*Not for use in calves intended for veal.

EPRINEX is effective in the removal and control of the following parasites in cattle:

Gastrointestinal Roundworms:
Haemonchus placei (adults and L4), Ostertagia ostertagi (including inhibited L4, adults and L4), Trichostrongylus axei (adults and L4), Trichostrongylus colubriformis (adults and L4), Trichostrongylus longispicularis (adults only), Cooperia oncophora (adults and L4), Cooperia punctata (adults and L4), Cooperia surnabada (adults and L4), Nematodirus helvetianus (adults and L4), Oesophagostomum radiatum (adults and L4), Bunostomum phlebotomum (adults and L4), Strongyloides papillosus (adults only), Trichuris spp. (adults  only). 

Lungworms: Dictyocaulus viviparus (adults and L4). 

Cattle Grubs (all parasitic stages): Hypoderma lineatum, Hypoderma bovis. 

Lice: Damalinia bovis, Linognathus vituli, Haematopinus eurysternus, Solenopotes capillatus. 

Mange Mites: Chorioptes bovis, Sarcoptes scabiei. 

Horn Flies: Haematobia irritans.

Top Reasons to use EPRINEX

1) EPRINEX is deadly effective.

  • EPRINEX kills 39 key species and stages of internal and external parasites, with 99.9 percent efficacy.1

2) You need parasite control you can count on.

  • EPRINEX has a 100 percent product satisfaction guarantee. If you aren’t completely satisfied, we’ll make it right.

3) EPRINEX is safe for all ages and stages. 

  • EPRINEX is safe for calves,* heifers, bulls, pregnant or open cows with no meat or milk withhold. 

*Not for use in calves intended for veal.

4) Get parasite control that pays in pounds. 

  • When it comes to putting on pounds, EPRINEX outperforms them all. On average, animals treated with EPRINEX put on more body weight than the leading competitors.2

5) Provide your herd with more comfort and while gaining milk production. 

  • External parasites make cows uncomfortable, which can lead to weight loss and decreased milk production. Animals treated with EPRINEX at calving showed a consistent increase in daily milk production of 2.07 pounds per day in the first six months of lactation compared to the placebo group (P < 0.002).

6) Because deworming should be this easy. 

  • The odor-free, pour-on formulation is convenient and even works in the rain, heat or freezing cold. 

Dosage and Safety

Dosage Information

Safety Information 

EPRINEX IMPORTANT SAFETY INFORMATION : No meat or milk withdrawal is required when used according to label. Do not use in calves intended for veal or unapproved animal species, as severe adverse reactions, including fatalities in dogs, may result.


1 Based on FOI summaries and label claims.
2 Beckett JL. Efficacy of pour-on dewormers differing in active ingredient and carrier on weight gain and fecal egg count in stocker beef cattle. College of Agriculture, Cal Poly State University.
3 Nødtvedt A, Conboy G, Doohoo I, et al. Increase in milk yield following eprinomectin treatment at calving in pastured dairy cattle. Vet Parasitol 2002;105(3):/191—206.

EPRINEX® and The Cattle Head Logo® are registered trademarks of Boehringer Ingelheim Animal Health USA Inc. ©2019 Boehringer Ingelheim Animal Health USA Inc., Duluth, GA. All Rights Reserved. JOB-US-BOV-1529

Product Resources

Contact Information

  • Boehringer Ingelheim Animal Health

    Cattle Division

    3239 Satellite Blvd NW,
    Duluth, GA 64506

    • Phone 866-638-2226
    • Fax 816-326-9167
    • e-mail