Brand: NOROMECTIN ® Oral + Se
Company: NORBROOK
DELIVERY FORM: «drench» for oral administration.
ACTIVE INGREDIENT(S): ivermectin 0.8 g/L (equivalent to 0.08%). Contains also 0,4mg/mL Selenium, which has no anthelmintic efficacy.
CHEMICAL CLASS of the active ingredient(s): macrocyclic lactone
INDICATIONS: SHEEP
PARASITES CONTROLLED* (spectrum of activity)
* Country-specific differences may apply: read the product label.
- Roundworms:
- Gastrointestinal roundworms (adults & 4th stage larvae): Teladorsagia (= Ostertagia) circumcincta (incl. inhibited larvae), Haemonchus contortus (incl. inhibited larvae), Trichostrongylus axei, Trichostrongylus colubriformis, Trichostrongylus vitrinus, Nematodirus spathiger, Nematodirus filicollis, Cooperia oncophora, Cooperia curticei, Oesophagostomum venulosum, Strongyloides papillosus, Chabertia ovina, Trichuris ovis.
- Lungworms (adults & 4th stage larvae): Dictyocaulus filaria.
- Gastrointestinal roundworms (adults & 4th stage larvae): Teladorsagia (= Ostertagia) circumcincta (incl. inhibited larvae), Haemonchus contortus (incl. inhibited larvae), Trichostrongylus axei, Trichostrongylus colubriformis, Trichostrongylus vitrinus, Nematodirus spathiger, Nematodirus filicollis, Cooperia oncophora, Cooperia curticei, Oesophagostomum venulosum, Strongyloides papillosus, Chabertia ovina, Trichuris ovis.
- Nasal Bots: Oestrus ovis, all larval stages.
- Itch Mites: Psorergates ovis
RECOMMENDED DOSE*
* Country-specific differences may apply: read the product label.
- Sheep: 2.5 ml product/10 kg bw (equivalent to 0.2 mg of ivermectin/kg)
Read the product label for further details on dosing
SAFETY
- LD50 (acute oral) in rats: 50 mg/kg (for the a.i.)
- LD50 (acute dermal) in rats: >660 mg/kg (for the a.i.)
Suspected poisoning? Read the article on ivermectin safety in this site.
Withholding periods (=withdrawal times) in days for meat & milk (country-specific differences may apply: read the product label)
- Meat: New Zealand: 10 days
- Milk for human consumption: New Zealand: Do not treat sheep producing milk for human consumption, or within 28 days before beginning lactation for human consumption.
WARNING !!!: Never use on humans, dogs or cats
You may be interested in the following articles in this site dealing with the general safety of veterinary products:
- Safety for humans
- Safety for domestic animals
- Safety for the environment
- Hazard classifications of pesticides
RESISTANCE PREVENTION
Risk of resistance? YES, resistance of gastrointestinal roundworms to macrocyclic lactones (incl. ivermectin) in ruminants is a very serious and increasing problem worldwide, particularly in sheep and goats. The most affected worm species are: Haemonchus spp, Ostertagia spp /Teladorsagia spp, Trichostrongylus spp, Nematodirus spp, Chabertia ovina.
This means that if this product does not achieve the expected efficacy against the mentioned parasites, it can be due to resistance and not to incorrect use, which is usually the most frequent cause of product failure.
Alternative chemical classes/active ingredients to prevent resistance of gastrointestinal roundworms through product rotation:
- Benzimidazoles, e.g. albendazole, febantel, fenbendazole, oxfendazole, etc. Similar or even worse resistance problems than macrocyclic lactones.
- Levamisole. Resistance to levamisole has been reported in most countries, but is usually less strong and frequent than to macrocyclic lactones.
- Monepantel: available only only for sheep & goats in some countries (e.g. Australia, UK & EU, New Zealand). First cases of resistance reported in New Zealand in 2013.
- Salicylanilides (e.g. closantel): effective only against certain gastrointestinal roundworms. Not available in some countries. Resistance to closantel has been reported in some countries.
- Tetrahydropyrimidines (e.g. morantel, pyrantel): effective only against certain gastrointestinal roundworms. Not available in some countries. Resistance to morantel has been reported in some countries.
- Nitroxinil: effective only against certain gastrointestinal roundworms (e.g. Bunostomum spp, Haemonchus spp, Oesophagostomum spp). Not available in some countries.
These alternative products may not be available in all countries, or may not be available as drenches, or may not be effective against all the concerned parasites.
It is highly recommended to periodically check the resistance status of each property performing appropriate tests (e.g. fecal egg counts) under supervision of a veterinary doctor. Such tests are now routinely available for most producers in developed countries.
Learn more about resistance and how it develops.
MARKETING
Are the active ingredients of this product ORIGINAL* or GENERICS**?
- GENERICS
*Meaning that they are still patent protected and generics are not yet available
**Meaning that they have lost patent protection and may be acquired from manufacturers of generic active ingredients other than the holder of the original patent.
COUNTRIES where this brand/product is marketed: New Zealand
GENERIC BRANDS available? Yes, in most countries, perhaps with a slightly different formulation.
Click here to learn more about GENERIC vs. ORIGINAL drugs.
For an overview on the most used drench brands for livestock click here.
COMMENTS
NOROMECTIN ORAL + Se for sheep from NORBROOK is one of the numerous drench brands with 0.08% generic ivermectin, in this case complemented with Selenium, which has no anthelmintic efficacy whatsoever.
The original brand, ORAMEC (or IVOMEC) Drench for sheep, was introduced by MERIAL in the 1980s as a specific oral formulation of ivermectin for sheep.
Ivermectin is a broad spectrum parasiticide with efficacy against internal parasites (mainly roundworms) and against external parasites as well (mainly mites, lice, grubs, etc). This is why it is called an endectocide (controls endoparasites and ectoparasites). Ivermectin was the first macrocyclic lactone discovered and introduced in the 1980s by MS&D AgVet (later MERIAL). It is the parasiticide for livestock and pets most widely used worldwide, with probably thousands of generic brands. Ivermectin is probably the best veterinary parasiticide ever developed, highly effective against roundworms and, depending on the delivery form and formulation, also against numerous external parasites (ticks, flies, lice, mites, etc.). As all macrocyclic lactones, ivermectin used alone is ineffective against tapeworms and flukes, regardless of the delivery form. It is massively used in livestock and horses, less in pets. Ist is also used as a human medicine, and against agricultural and household pests.
However, this particular drench formulation for oral administration to sheep is not effective against most of these external parasites.
There are also countless brands with mixtures of ivermectin with other active ingredients, both as drenches and as injectables. In some countries slow-release capsules for oral administration to sheep that ensure a long period of protection against re-infestation are also available.
In ruminants, reducing the amount of feed slows down the exit flow of the rumen and prolongs the time during which the active ingredient remains there and is absorbed. Consequently it is advisable to reduce the access of animals to feed (especially to fresh pasture, not to water) 24 hours before administration. For the same reason, it is better to keep the animals away from food for about 6 hours after drenching. However sick or weak animals should not be kept away from food and fasting animals should have access to water.
Click here for general information on good practices for the prevention and control of gastrointestinal worms in livestock.
DISCLAIMER
This article IS NOT A PRODUCT LABEL. It offers complementary information that may be useful to veterinary professionals and users that are not familiar with veterinary antiparasitics.
Information offered in this article has been extracted from publications issued by manufacturers, government agencies (e.g. EMEA, FDA, USDA, etc.) or in the scientific literature. No guarantee is given on its accuracy, integrity, sufficiency, actuality and opportunity, and any liability is denied. Read the site's DISCLAIMER.
In case of doubt contact the manufacturer or a veterinary professional.