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Noromectin Horse Wormer

  • Oral Paste » 1 Syringe (Treats 700kg Horse) £7.90


Noromectin is an Ivermectin-based horse wormer in paste form. Killing both the larval and adult stages of small and large Redworms, Lungworms, and Bots. With each syringe treating a 700kg horse, Noromectin is a powerful and effective worming treatment, particularly useful on small Redworms which have a high Benzimidazole resistance.

The presence of worms can be checked in your horse using a Worm Testing Kit.


Noromectin 1.87% Oral Paste for Horses kills the adult and
some larval stages of the important internal parasites of horses.
Noromectin 1.87% Oral Paste for Horses at the recommended
dose rate of 200mcg ivermectin per kg bodyweight is indicated
for the treatment of the following internal parasites of horses:
Large strongyles (redworms): Adults and 4th larval (arterial)
stages of Strongylus vulgaris, adults and tissue larval stages of S.
edentatus and adults of S. equinus.
Adult small strongyles (redworms) including
benzimidazole resistant strains: Cyathostomum catinatum,
Cyathostomum pateratum, Cylicocyclus ashworthi, Cylicocyclus
elongatus, Cylicocyclus insigne, Cylicocyclus leptostomum,
Cylicocyclus nassatus, Cylicocyclus radiatus, Cylicostephanus
asymetricus, Cylicostephanus bidentatus, Cylicostephanus
calicatus, Cylicostephanus goldi, Cylicostephanus longibursatus,
Cylicostephanus minutus, Cylicodontophorus bicornatus and
Gyalocephalus capitatus.
Adult and immature lungworms: Dictyocaulus arnfieldi.
Pinworms: Adult and immature Oxyuris equi.
Ascarids: Adult and 3rd and 4th stage Parascaris equorum.
Hairworms: Adult Trichostrongylus axei.
Intestinal threadworms: Adult Strongyloides westeri.
Neck threadworms: Microfilariae of Onchocerca spp.
Oral and gastric larval stages of stomach bots: Gasterophilus spp.
Ivermectin is not effective against encysted larval stages of the
small strongyles.

Dosage & Administration

Noromectin 1.87% Oral Paste for Horses is administered orally
at a single dose rate of 200mcg/kg of bodyweight. One syringe
division of paste should be administered per 100kg
bodyweight (based on the recommended dosage of 200mcg/kg). Each syringe delivers 140mg ivermectin, sufficient to
treat 700kg of bodyweight. The tip of the syringe barrel should
be inserted at the interdental space (the gap between the
front and back teeth). The horse’s head should be raised for a
few seconds after dosing.

Horses’ weight should be accurately determined for the correct
use of the paste. The animal’s mouth should be free of food to
ensure swallowing.

For best results all horses in a yard or grazing together should
be included in a regular parasite control programme and
treated at the same time.

All horses should be included in a regular parasite control
programme, with particular attention being paid to mares,
foals and yearlings. Foals should be treated initially at 6-8
weeks of age and routine treatment repeated as appropriate.
Retreatment should be carried out according to the
epidemiological situation, but not less than at a 30 day interval.
Do not use the same syringe to treat more than one animal
unless horses are running together or in direct contact with
each other on the same premises.

As with all anthelmintics, a veterinary surgeon should establish
appropriate dosing programmes and stock management to
achieve adequate parasite control and reduce the likelihood of
anthelmintic resistance developing.

Withdrawal Period

Animals must not be slaughtered for human consumption
during treatment.Horses must not be treated within 34 days of slaughter for human consumption. Do not use in mares producing milk for human consumption.

Contraindictions, Warnings etc

Mild transitory signs (slowed pupillary light response and
depression) have been seen at a higher dose of 1.8mg/kg (9
times the recommended dose level). Other signs seen at
higher doses include mydriasis, ataxia, tremors, stupor, coma
and death. The less severe signs have been
transitory. Although no antidote has been identified,
symptomatic therapy may be beneficial.

Noromectin 1.87% Oral Paste for Horses has been formulated
for use in horses only. Dogs and cats may be adversely affected
by the concentration of ivermectin in the product if they are
allowed to ingest spilled paste or have access to used syringes.
Do not smoke or eat while handling the product. Wash hands
after use. Avoid eye contact. This is a unidose product which
should be disposed of after use.

Frequent and repeated use may lead to the development of

Do not use in dogs or cats as severe adverse reactions may

Some horses have experienced reactions involving cutaneous
swelling and itching shortly after treatment. In most of these
cases, the horses have been diagnosed as carrying heavy
infections of Onchocerca microfilariae, and it is assumed the
reactions are a result of the microfilariae dying in large
numbers. Although the signs will resolve spontaneously in a
few days, symptomatic treatment may be advisable. Consult
your veterinary surgeon should these signs persist.
Horses of all ages, including young foals, pregnant mares and
breeding stallions have been treated with no adverse effects
on their health and fertility. Ivermectin passes readily into milk.
When administering to lactating females, residues of
ivermectin could be present in the maternal milk. No studies
have been reported on the effect of ingestion of milk on the
development of newborn foals.

Identification of substance/ preparation and of company/ undertaking

Product Name - Noromectin Paste for Horses

Supplier - Norbrook Laboratories Ltd, Station Works, Newry, Co.Down ,N.Ireland, BT35 6JP

Telephone No. - +44 (0) 28 3026 4435

Fax No. - +44 (0) 28 3026 1721

E-Mail -

Emergency Telephone - +44 (0) 28 3026 4435

Hazards identification

Physical and Chemical Hazards : Notclassified as dangerous under EEC Directives 67/548/EEC,88/379/EEC or 99/45/EC.

Environmental Hazards : Ivermectin is harmful to aquatic life. Surface waters or ditches should not be contaminated with product or used containers.

Adverse Human Health Effects : None known.


Substance/Preparation : Preparation.

Active Ingredients : 22, 23-Dihydroavermectin B1( Ivermectin ).

Description : Anthelmintic Endectocide ( Chemical Group 3-AV ).

Chemical Family : Avermectins.

First aid measures

Inhalation : Remove to fresh air. If any signs or symptoms occur or persist seek medical advice.

Skin Contact : Wash thoroughly with soap and water. Remove contaminated clothing and wash before use.

Eyes Contact : Immediately flush eyes with copious amounts of water for at least 15 minutes.

If irritation persists, seek medical attention.

Ingestion : Do not induce vomiting. Seek medical attention.

Fire fighting measures

Extinguishing media : Use carbon dioxide, dry chemical or alcohol-resistant foam spray extinguishers. Use water spray to cool fire-exposed containers. A fine water mist may be used to smother or to disperse vapours.

Fire and explosion hazards : None.

Accidental release measures

Personal Precautions : Provide good ventilation. Prevent skin and eye contact.

Environmental Precautions : Keep away from drains, surface-water, ground-water and soil.

Method for Clean-up : Absorb small spills on spill pillows, sand, sawdust or other suitable absorbing mat.

Handling & storage

Handling : Avoid contact with eyes, skin or clothing. Do not breathe vapours or mist. Do not ingest. Do not smoke or eat while handling the product. Wash thoroughly after handling.

The containers should be stored in their original boxes when not in use.

Storage : Store in closed containers in a cool, dry, well-ventilated area, below 25°C and away from oxidisers, heat, sparks and open flame. Protect containers from physical damage and light. Keep container closed when not in use. Do not transfer contents to unlabeled containers.Use only with adequate ventilation.Keep out of reach of children.

Exposure controls/personal protection

Component - Occupational Exposure Standard Ivermectin - Not Established

For pure ivermectin:

  • LD50 ( Oral, mouse ) 25 mg/kg
  • LD50 ( Oral, rat )50 mg/kg
  • LD50 ( Dermal, rat )>660 mg/kg

Protective Equipment : Wear vinyl, nitrile or rubber gloves, a waterproof bib-apron and suitable eye protection when applying the product.

Physical & chemical properties

Form : Viscous paste,

Colour : White.

Odour : None.


Stability : Stable under normal temperatures and pressures.

Conditions to avoid : None known.

Materials to avoid : None known.

Toxicological information

Exposure Effects ( Acute )

Eye Contact : Direct contact of the paste suspension with eyes can cause irritation.

Skin Contact : Prolonged or repeated contact with Noromectin Paste for Horses may cause irritation and/or drying and cracking of the skin.

Inhalation : None known.

Ingestion : Oral toxicity of the Noromectin Paste for Horses is slow. Pure ivermectin is considered highly toxic in acute animal studies. If overexposed to ivermectin, symptoms may include decreased activity, slow rate of breathing, dilation of the pupils, muscle tremors and inco-ordination.

Exposure Effects ( Chronic )Unknown for the product mixture. When this product is used according to the directions, prolonged exposure of man is not expected. Ivermectin has tested negative in several mutagenicity studies.


Product/Residues : Do not discharge the product material into surface or waste water. For disposal, use an incinerator licensed for chemical waste.

Package : Dispose of waste containers using regular disposal methods in accordance with local and national environmental regulations.

Other information

ML : 2000/01 For Animal Treatment Only

Vm : 02000/4208

Revision Date :14/05/10

Revision No :06

Suppliers data sheets and various chemicals and pharmaceuticals databases were used to compile this sheet.

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Suitable for foals

6th Jul 2016
Ginny Howe
  • VioVet Customer Since: August 2015
  • From: Oxfordshire, United Kingdom

is this product suitable for foals? and from what age?

John Cousins
  • Veterinary Surgeon

This product is recommended for foals from 6 weeks of age.