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Cattle Parasite Control Guide

When trying to choose the correct product for your livestock there are a number of factors to take into account to ensure you get optimal coverage for the right price all while reducing the risk of resistance on your farm. Our guide to parasite control should give you all the information you need to make the right choice for you.

What kind of wormer should I use?

Wormers are used to treat and control parasitic infections from roundworm, lungworm, tapeworms and liver fluke. These wormers (or Anthelmintics) can be categorised into the following groups.

Group 1: Benzimidazoles (BZ)

Group 2: Levamisole (Imidazothiazoles) (LV)

Group 3: Macrocyclic lactones, including avermactins and milbemycins (ML)

Group 4: Amino acetonitrile derivatives (Monepantel) (AD)

Group 5: Spiroindoles (SI)

Wormers in these groups are effective against all the major species or roundworm and lungworm, with some also being effective against liver fluke and tapeworms. Wormers from Group 3 (ML) both injectables and pour ons are effective against ectoparasites.

GutwormsWorming is a necessity when trying to break the cycle of gutworms especially where cattle are grazing in infected areas. Treatment should aim to reduce the disease and minimise contamination of the pasture. Symptoms of gutworm can include diarrhoea, decreased appetite and loss of weight. Gutworm can cause severe damage to the stomach and small intestine which will cause parasitic gastroenteritis, this will not only negatively affect the health of the animal but will affect the profitability for the farmer.

Macrocyclic Lactone (ML), Benzimidazoles (BZ) and Levamisole (LV) products are most commonly used in the treatment of gutworm.

LungwormsLungworm infection usually occurs in younger livestock in the later stages of the grazing season. Without adequate lungworm control cattle can me more susceptible to pneumonia. Symptoms of lungworm can include a short, sharp cough that becomes worse with exercise, in severe cases the animal will have obvious difficulty breathing. Lungworm infections cause a high susceptibility to respiratory viruses and bacteria. Infected cattle are prone to contracting severe bronchial pneumonia which if left untreated can lead to death.

Macrocyclic Lactone (ML), Benzimidazoles (BZ) and Levamisole (LV) products are most commonly used in the treatment of lungworm.

Liver Fluke

There are many factors to take into account when treating for liver fluke in cattle. In particular you should take into account the risk,  the time of year and the stage of development of the fluke. You should always seek advice from a vet or responsible seller.

If rumen fluke is suspected you should discuss your options with your vet as treatment is not always required and there are very few products that have an impact on rumen fluke.

Different flukicides will kill different stages of the fluke life cycle so it important to chose the correct product for the stage you are treating for.
EctoparasitesThe spread of mange and lice is caused by close contact between the animals, this is why ectoparasites spread more easily at the time of housing cattle. Because ectoparasites are spread so easily it is important to control an outbreak by not only treating cattle with obvious signs but all animals that have been in contact.Ectoparasites can be controlled using synthetic pyrethroids or Macrocyclic Lactone (ML) Products


Combination Products

Products that combine both a wormer and a flukicide can seem like an easy option when treating cattle but there are some important questions to ask before choosing a combination product

Do the cattle need to be treated for both worms and fluke?

Is the wormer appropriate for the stages of worms you are treating against?

Is the flukicide appropriate for the stages of fluke you are treating against?

Wormer Resistance In Cattle

​The problem of wormer resistance when treating cattle is a growing problem not only in Ireland but in countries all around the world. Resistance is not always obvious at first but the results can be detrimental to your herd. Resistance is caused by the continuous use of the same group of wormer every year. A combination of tightly monitoring your herd and a strict dosing routine should reduce the risk of resistance on your farm.

Signs of resistance on your land

  • The liveweight gain of you herd is falling year after year
  • Individual animals in your herd are failing to thrive despite adequate nutrition
  • Animals are still scouring even after sufficient treatment
  • Obvious signs of disease present in animals that have been treatmented

​How to prevent resistance

  • Use a wormer from a chemical group that is most suitable for your situation and will be most effective. If a resistance to a certain chemical has been confirmed on your land ensure to use a wormer from a different chemical group.
  • Make sure to weigh your animals and dose appropriately, under dosing or over dosing will greatly increase the chances of resistance on your land.
  • Rotate the chemical group of wormers that you use each year and make sure to avoid any chemicals that there is a confirmed resistance for 
  • Monitor the performance of your herd throughout the year, if there are signs of poor thrive or a suspicion of resistance on your land contact your vet to discuss your options.
Essentials Of Dosing Cattle

Choosing the correct product for the parasites you are targeting  is essential. This will give predictable results which will lessen the chances of having to retreat. This will in turn save time, money and reduce the chances of resistance on your farm. Below are some essential tips to ensure you are treating your livestock properly. Which ever product and method of administration you choose it is essential to always follow the manufacturer's instructions carefully.

- Choose an appropriate product for the parasites you are targeting

- Make sure to store wormers appropriately, normally away from sunlight, away from extreme temperatures and sometimes in a fridge. All these details will be available on documents accompanying the wormers.

- Ensure all dosing equipment is clean, compatible with your choice of wormer and is measuring correctly.

- Dose according to liveweight to avoid under or over dosing

- Record everything properly. Product used, amount used, batch number, expiry date, animal id, treatment date and withdrawal periods

- Do not mix wormers together as this can cause the product to be inactive

Methods Of Administration

Pour Ons

- Pour Ons should be applied down along the length of the flattest part of the animal's back

- Animals should not be treated when wet or if rain is expected, unless the product specifically says it is ok to do so

- Damaged skin should be avoided

- Areas contaminated with mud or manure should be avoided and cleaned before application


- Clean and sterile equipment should always be used, if using the same syringe for multiple animals the needle should be disinfected between injections

- If the injection site is dirty it should be cleaned with an alcohol wipe before injecting

- Use an appropriate sized needle for the animal you are injecting

- Make sure the animal is appropriately restrained before injecting

- For subcutaneous injections raise a fold of skin and inject into the space created, as shown in the diagram below

- Dispose of used needles and syringes in an appropriate sharps container

Oral Drenches

- Ensure all drenching equipment is clean and calibrated

- Ensure the animal is restrained with their head held up

- Slide the  nozzle of the dosing gun into the side of the mouth and over the tongue so that the entire dose is swallowed immediately

Products by group

Group 1: Benzimidazole (BZ) (White)

ProductCompany NameChemical NameParasites ControlledAdministrationWithdrawal (Meat)Milk Withhold
RoundwormLungwormTapewormLiver FlukeMitesWarblesLiceHornflyEyeworm
Albex 10%ChanelleAlbendazoleYesYesYesYes (Adult)NoNoNoNoNoOral Drench14 Days60 Hours
Albex 2.5%ChannelleAlbendazoleYesYesYesYes (Adult)NoNoNoNoNoOral Drench14 Days60 Hours
Fenben 10AncareFenbendazoleYesYesNoNoNoNoNoNoNoOral Drench21 DaysX
Tramazole 10%UnivetAlbendazoleYesYesYesYes (Adult)NoNoNoNoNoOral Drench14 Days60 Hours


Group 2: Levamisole (LV) (Yellow)

ProductCompany NameChemical NameParasites ControlledAdministrationWithdrawal (Meat)Milk Withhold
RoundwormLungwormTapewormLiver FlukeMitesWarblesLiceHornflyEyeworm
Levacide 7.5% InjectionNorbrookLevamisoleYesYesNoNoNoNoNoNoNoInjection SC28 DaysX


Group 3: Macrocycli Lactones (ML) (Clear)

ProductCompany NameChemical NameParasites ControlledAdministrationWithdrawal (Meat)Milk Withhold
RoundwormLungwormTapewormLiver FlukeMitesWarblesLiceHormflyEyeworm
Abacare 1% Pour OnJ&M VeterinaryAbamectinYesYesNoNoYesYesYesNoNoPour On35 DaysX
Animec 1% InjectionChanelleIvermectinYesYesNoNoYesYesYesNoNoInjection SC49 DaysX
Animec 0.5% Pour OnChanelleIvermectinYesYesNoNoYesYesYesNoNoPour On49 DaysX
Cydectin 10% LAZoetisMoxidectinYesYesNoNoYesYesYesNoNoEar Injection108 DaysX
Dectomax InjectionElancoDoramectinYesYesNoNoYesYesYesNoYesInjection SC70 DaysX
Dectomax Pour OnElancoDoramectinYesYesNoNoYesYesYesYesYesInjection SC35 DaysX
Eprecis 20mg InjectionCeva AHEprinomectinYesYesNoNoYesYesYesYesNoInjection SC63 DaysZero
Eprinex Pour OnBoehringerEprinomectinYesYesNoNoYesYesYesNoNoPour On15 DaysZero
Eprizero Pour OnNorbrookEprinomectinYesYesNoNoYesYesYesYesNoPour On10 DaysZero
Imec 1% InjectionAcravetIvermectinYesYesNoNoYesYesYesNoNoInjection SC49 DaysX
Imec Pour OnAcravetIvermectinYesYesNoNoYesYesYesNoYesPour On28 DaysX
Ivome Classic Pour OnBoehringerIvermectinYesYesNoNoYesYesYesYesYesPour On15 DaysX
Turbomec 1% InjectionBimedaIvermectinYesYesNoNoYesYesYesNoNoInjection SC49 DaysX
ZeromectinChanelleEprinomectinYesYesNoNoYesYesYesNoNoPour On28 DaysZero


Combination Prtoducts

ProductCompany NameChemical NameParasites ControlledAdministrationWithdrawal (Meat)Milk Withhold
RoundwormLungwormTapewormLiver FlukeMitesWarblesLiceHornflyEyeworm
Animec Super InjectionChanelleIvermectin ClorsulonYesYesNoYes (Adult)YesYesYesNoYesInjection SC66 DaysX
Bimectin PlusBimedaIvermectin ClorsulonYesYesNoYes (Adult)YesYesYesNoYesInjection SC66 DaysX
Chan Broad SpecChanelle

Rafoxanide Levamisole

YesYesNoYes (Adult)NoNoNoNoNoOral Drench60 DaysX
Closamectin InjectiomNorbrookIvermectin ClorsulonYesYesNoYes (Adult and Immature over 7 weeks)YesYesYesNoYesInjection SC48 DaysX
Closamectin Pour OnNorbrookIvermectin ClorsulonYesYesNoYes (Adult and Immature over 7 weeks)YesYesYesNoYesPour On28 DaysX
Curafluke 10%UnivetRafoxanide FenbendazoleYesYesNoYes (Adult and Immature)NoNoNoNoNoOral Drench60 DaysX
Curafluke 5%UnivetRafoxanide FenbendazoleYesYesNoYes (Adult and Immature)NoNoNoNoNoOral Drench60 DaysX
Cydectin TriclamoxZoetisMoxidectin TriclabendazoleYesYesNoYes (Adult and immature)NoNoYesNoNoPour On143 DaysX
Ivomec Super InjectionBoehringerIvermectin ClorsulonYesYesNoYes (Adult)YesYesYesNoYesInjection SC66 DaysX
Levafas DiamondNorbrookLevamisole OxyclozanideYesYesNoYes (Adult)NoNoNoNoNoOral Drench5 DaysX
Topimec Super InjectionChanelleIvermectin ClorsulonYesYesNoYes (Adult)YesYesYesNoYesInjection SC66 DaysX



ProductCompany NameChemical NameParasites ControlledAdministrationWithdrawal (Meat)Milk Withhold
RoundwormLungwormTapewormLiver FlukeMitesWarblesLiceHornflyEyeworm
Endofluke 10%BimedaTriclabendazoleNoNoNoYes (All Stages)NoNoNoNoNoOral Drench56 DaysX
Fasinex 240ElancoTriclabendazoleNoNoNoYes (All Stages)NoNoNoNoNoOral Drench56 DaysX
Flukiver InjectionElancoClosantelNoNoNoYes (Adult and Immature)NoNoNoNoNoInjection SC77 DaysX
RumenilChanelleOxyclozanideNoNoYes (Segments Only)Yes (Adult only)NoNoNoNoNOOral Drench28 Days72 Hours
Santiola InjectionKRKAClosantelNoNONoYes (Adult and Immature)NoNoNoNoNoInjection SC77 DayX
Tribex 10%ChanelleTriclabendazoleNoNoNoYes (All Stages)NoNoNoNoNoOral Drench56 DaysX
TriclabenChanelleTriclabendazoleNoNoNoYes (All Stages)NoNoNoNoNoOral Drench56 DaysX
TrodaxBoehringerNitroxynilNoNoNoYes (Adult and Late Immature)NoNoNoNoNoInjection sc60 DaysX


Ectoparasiticides - Synthetic Pyrethroids

ProductCompany NameChemical NameParasites ControlledAdministrationWithdrawal (Meat)Milk Withhold
RoundwormLungwormTapewormLiver FlukeMitesWarblesLiceFliesHornflyEyeworm
BayticolBayerFlumethrinNoNoNoNoNoNoYesNoNoNoPour On5 Days10 Days
ButoxMSDDeltamethrinNoNoNojNoNoNoYesYesYesNoPour On 18 Days12 Hours
EctospecBimedaCypermethrinNoNoNoNoNoNoYesYesNoNoPour On10 Days12 Hours
Flectron Fly TagZoetisCypermethrinNoNoNoNoNoNoNoYesNoNoEar TagZeroZero
Spot OnZoetisDeltamethrinNoNoNoNoNoNoYesYesNoNoSpot On17 DaysZero
SpotinorNoorbrookDeltamethrinNoNoNoNoNoNoYesYesYesNoSpot On17 DaysZero