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Dectospot (deltamethrin)
Dectospot (deltamethrin)

Dectospot (deltamethrin)

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Dectospot is licensed as a topical application for the control of lice and flies on cattle; for ticks, lice, keds and established blowfly strike on sheep and for lice and ticks on lambs.​ The active ingredient in Dectospot is deltamethrin, which is one of the most reliable and safest to use insecticides in the world.

Active Ingredient: Deltamethrin

Target Species: Sheep and cattle

Treats and Controls: Lice, Flies on cattle. Ticks, keds and blowfly in sheep

Administration Method: Pour on

Withdrawal Time: 17 days for cattle intended for meat or offal, zero hours for cattle producing milk for human consumption, 35 days for sheep intended for meat or offal, not permitted for use on sheep producing milk for human consumption.

Dosage for cattle: 10 ml per animal. 

Body Weight Dose Volume Doses Per Pack
1ltr 2.5ltr
All Sizes 10ml 100 250

Dosage for sheep above 10kg: 5 ml per animal. 

Body Weight Dose Volume Doses Per Pack
1ltr 2.5ltr
Above 10kg 5ml 200 500

Dosage for lambs under 10kg: 2.5 ml per animal. 

Body Weight Dose Volume Doses Per Pack
1ltr 2.5ltr
All Sizes 2.5ml 400 1000

Always read the label and all enclosed information for Dectospot Insecticide before administering to animals!

How to use Dectospot 

Apply a single dose with the special dispenser pack or the Dectospot Applicator on one spot on the mid-line of the back at the shoulders, as directed on dispenser or applicator gun pack.

Lice on cattle: One application will generally eradicate all lice within 4 - 5 weeks during which time lice hatch from the eggs and are killed. It may be necessary on rare occasions to re-treat an animal 6 - 8 weeks later.

Flies on cattle: Good control can be expected for 4 - 8 weeks where horn flies dominate. Treatment for fly control should not be repeated within four weeks.

Ticks on sheep and lambs: Application will control ticks for up to 6 weeks after treatment.

Keds and lice on sheep, and lice on lambs: Application will reduce the incidence of a biting louse or ked infestation over a 4 - 6 week period after treatment. N.B. For control of ticks, keds and lice on sheep, the fleece should be parted and the spot on applied to the skin of the animal.

When using the Dectospot applicator, application to the skin can be achieved by inserting the T bar to separate the fleece and penetrate down to the skin level before squeezing the applicator handle. Apply directly to the maggot-infected area as soon as the fly strike is seen. One application will ensure blowfly larvae are killed in a short time. In the case of more advanced strike lesions, clipping out of stained wool before treatment is advisable.​

Features on Dectospot

  •  Treat and control lice and flies on cattle
  • Treats ticks, lice, keds and blowfly in sheep. 
  • The active ingredient is deltamethrin
  • Reliable and safe.

This Product is only licensed for sale in the Republic of Ireland

Click here to Download Data Sheet

Health Products Regulatory Authority

Summary of Product Characteristics

Dectospot 10 mg/ml Pour-on Solution for Cattle and Sheep

Each ml contains
Active Substance:
Deltamethrin 10.0 mg
For the full list of excipients, see section 6.1.

Pour-on Solution
A clear pale gold oily liquid

4.1 Target Species

Cattle and sheep.

4.2 Indications for use, specifying the target species
On cattle:
For the treatment and prevention of infestations by both sucking and biting lice, including Bovicola bovis, Solenopotes capillatus, Linognathus vituli and Haematopinus eurysternus.
Also as an aid in the treatment and prevention of infestations by both biting and nuisance flies including Haematobia irritans, Stomoxys calcitrans, Musca species and Hydrotaea irritans.

On sheep:
For the treatment and prevention of infestations by ticks Ixodes ricinus and by lice (Linognathus ovillus, Bovicola ovis), keds (Melophagus ovinus) and for the treatment of established blowfly strike (usually Lucilia spp.).
On lambs: For the treatment and prevention of infestations by ticks Ixodes ricinus and by lice Bovicola ovis.

4.3 Contraindications
Do not use on convalescent or sick animals.
Do not use in cases of hypersensitivity to the active substance or to any of the excipients.
Extra-label use of the product in the non-target species dogs and cats can lead to toxic neurological signs (ataxia, convulsions, tremors), digestive signs (hypersalivation, vomiting) and may be fatal.
Do not use in animals with extensive lesions of the skin.

4.4 Special warnings for each target species
The product will reduce the number of flies resting directly on the animal but it is not expected to eliminate all flies on a farm. Resistance to deltamethrin has been recognised and therefore the strategic use of the product should be based on local and regional epidemiological information about susceptibility of parasites, and used in association with other pest management methods. 

Care should be taken to avoid the following practices because they increase the risk of development of resistance and could ultimately result in ineffective therapy:
 too frequent and repeated use of ectoparasiticides from the same class over an extended period of time;
 underdosing which may be due to underestimation of bodyweight, misadministration of the product or lack of calibration of the dosing device.
Cases of resistance to deltamethrin have been reported in stinging and nuisance flies in cattle and lice in sheep.
To avoid resistance, the product should only be used if the susceptibility of the local fly population to the active substance is assured.

4.5 Special precautions for use
Special precautions for use in animals

The product is for external use only.
Do not apply on or near the animal’s eyes and mucous membranes as Deltamethrin is an irritant.
Care should be taken to prevent animals grooming after administration of the product.
Avoid use of the product during extremely hot weather and ensure animals have adequate access to water.
The product should only be administered onto undamaged skin as toxicity is possible due to absorption from major skin lesions.
However, signs of local irritation may occur after treatment as skin may be already affected by infestation.

Special precautions to be taken by the person administering the veterinary medicinal product to animals
People with known hypersensitivity to the active substance or to any of the excipients should avoid contact with the veterinary medicinal product.
Personal protective equipment consisting of waterproof apron and boots and impervious gloves should be worn when either applying the product or handling recently treated animals.
Remove heavily contaminated clothing immediately and wash before re-use.
Wash splashes from skin immediately with soap and plenty of water.
Wash hands and exposed skin after handling this product.
In case of contact with eyes, rinse immediately with plenty of clean, running water and seek medical advice.
In case of accidental ingestion, wash out mouth immediately with plenty of water and seek medical advice and show the package leaflet or the label to the physician.
Do not smoke, drink or eat while handling the product.
This product contains deltamethrin which may produce tingling, itchiness and blotchy redness on exposed skin.
If you feel unwell after working with this product, seek medical advice immediately and show the package leaflet or the label to the physician.

Other precautions
Deltamethrin is very toxic to dung fauna, aquatic organisms and honey bees, is persistent in soils and may accumulate in sediments.
The risk to aquatic ecosystems and dung fauna can be reduced by avoiding too frequent and repeated use of deltamethrin (and other synthetic pyrethroids) in cattle and sheep, e.g. by using only a single treatment per year on the same pasture.
The risk to aquatic ecosystems will be further reduced by preventing treated sheep from entering watercourses for one hour immediately after treatment.

4.6 Adverse reactions (frequency and seriousness)
Neurological signs (general agitation or prostration, tremors, abnormal movements), have been recorded.
The frequency of these adverse reactions is very rare.
Skin disorders (squamosis photosensitisation and pruritus) have been observed within 48 hours after treatment.
The frequency of this adverse reaction is very rare.
The frequency of adverse reactions is defined using the following convention:
- very common (more than 1 in 10 animals treated displaying adverse reaction(s))
- common (more than 1 but less than 10 animals in 100 animals treated)
- uncommon (more than 1 but less than 10 animals in 1,000 animals treated)
- rare (more than 1 but less than 10 animals in 10,000 animals treated)
- very rare (less than 1 animal in 10,000 animals treated, including isolated reports).

4.7 Use during pregnancy, lactation or lay
The safety of the veterinary medicinal product has not been established during pregnancy and lactation.
Laboratory studies in rats and rabbits have not produced any evidence of teratogenic effects.
Use only according to a benefit/risk assessment by the responsible veterinarian.

4.8 Interaction with other medicinal products and other forms of interactions
Do not use with any other insecticide or acaricide.
The toxicity of deltamethrin is enhanced in combination with organophosphorous compounds, in particular.

4.9 Amounts to be administered and administration route
For external use.
Pour-on application.

Cattle: 100 mg of deltamethrin per animal, corresponding to 10 ml of the product.
Sheep: 50 mg of deltamethrin per animal, corresponding to 5 ml of product.
Lambs (under 10 kg bodyweight or 1 month of age): 25 mg of deltamethrin per animal, corresponding to 2.5 ml of product.
The product must be applied without dilution to the mid-point of the shoulders as shown in the diagrams below.
For treatment and prevention of infestations by ticks, keds and lice on sheep, the fleece should be parted and the product applied to the skin of the animal.
For maximum effectiveness it is advisable to:
 treat shortly after shearing (animals with short fleece),
 keep treated sheep separated from untreated sheep to avoid re-infestation
The duration of protection against flies is maintained for 4-6 weeks.

Lice on cattle:
One application will generally eradicate all lice.
Complete clearance of all lice may take 4-5 weeks during which time lice hatch from the eggs and are killed.
A very few lice may survive on a small minority of animals.

Keds and lice on sheep:
One application will reduce the incidence of a biting louse or ked infestation over a 4-6 week period after treatment. Established blowfly strike on sheep:
Apply directly to the maggot infected area as soon as the fly strike is seen.
One application will ensure blowfly larvae are killed in a short time.
In the case of more advanced strike lesions, clipping out of stained wool before treatment is advisable.
The influence of weather on the duration of efficacy has not been investigated.
The duration of the prevention period against Musca spp. may vary.
The product should be applied using an appropriate application device:
- For the 250 ml and 500 ml presentations a graduated chamber attached to the container is used.
- For the 1 litre and 2.5 litre presentations it is recommended to use an appropriate applicator.
An appropriate applicator should comply with the following specifications :
- it should deliver doses of 5 ml and 10 ml.
- it should be supplied with a flexible hose of internal diameter between 6 mm and 12 mm.
The recommended use of the application devices is illustrated on the following diagrams.
1. Use of the graduated chamber on the 250 ml and 500 ml containers: 
2. Attaching the 1 and 2.5 litre containers to the appropriate applicator:

4.10 Overdose (symptoms, emergency procedures, antidotes), if necessary
Some adverse effects have been seen following overdose.
These include paraesthesia and irritation in cattle, as well as intermittent or attempted urination in young lambs. These have been shown to be mild, transient and resolve without treatment.

4.11 Withdrawal period(s)
Meat and offal - 18 days
Milk - zero hours

Meat and offal - 35 days
Milk - 24 hours
Due to the significant likelihood of cross-contamination of non-treated animals with this product due to grooming (licking), treated animals should be kept separate from non-treated animals throughout the maximum withdrawal period.
Non-compliance with this recommendation may lead to residues in non-treated animals.


ATCvet code:


Pharmacotherapeutic group:
Ectoparasiticides, insecticides and repellents.
Pyrethrins and pyrethroids.

5.1 Pharmacodynamic properties
The deltamethrin molecule belongs to the family of synthetic pyrethroids.
It is characterized by its insecticidal and acaricidal activity, acting by altering the permeability of the sodium channel molecule causing hyperarousal, followed by paralysis (knockdown), with tremors and mortality of parasites.
Two physiological mechanisms are likely to contribute to deltamethrin-resistance: mutation of the molecular deltamethrin target or genomic selection for increased expression of mitochondrial oxidase and esterase enzymes. 

5.2 Pharmacokinetic particulars
After dermal application, deltamethrin is slightly absorbed through skin of cattle and sheep.
Pyrethroids are metabolised through oxidative and neurotoxic pathways.
The main route of excretion of the absorbed amount in the target animal is the faeces.

5.3 Environmental properties
Deltamethrin has the potential to adversely affect non-target organisms, both in water and in dung.
Following treatment, excretion of potentially toxic levels of deltamethrin may take place over a period of 4 weeks Faeces containing deltamethrin excreted onto pasture by treated animals may reduce the abundance of dung feeding organisms which may impact on the dung degradation.
Deltamethrin is very toxic to dung fauna, aquatic organisms and honey bees, is persistent in soils and may accumulate in sediments.

6.1 List of excipients

Triglycerides, medium chain

6.2 Major incompatibilities
None known.

6.3 Shelf-life
Shelf life of the veterinary medicinal product as packaged for sale: 3 years.
Shelf life after first opening the immediate packaging: 3 months.

6.4 Special precautions for storage
Store upright in the original container.
Keep the container in the outer carton in order to protect from light.
Keep away from food, drink and animal feeding stuffs.

6.5 Nature and composition of immediate packaging
250 ml and 500 ml high density polyethylene flexipacks with twin neck dispenser, internal graduated calibration chamber and polypropylene heat-sealed screw cap.
1 litre and 2.5 litre high-density polyethylene flat bottom containers with polypropylene closures and induction heat-sealed wadding.
A spouted cap is provided with the 1 litre and 2.5 litre presentations. Not all pack sizes may be marketed.

6.6 Special precautions for the disposal of unused veterinary medicinal products or waste materials derived from the use of such products
Any unused veterinary medicinal product or waste materials derived from such veterinary medicinal product should be disposed of in accordance with local requirements.
The product should not enter water courses as this may be dangerous for fish and other aquatic organisms.
Do not contaminate surface waters or ditches with the product or used container.
Deltamethrin has been shown to be persistent in soil. 

Bimeda Animal Health Limited
2, 3 & 4 Airton Close
Airton Road
Dublin 24


Date of first authorisation: 12  February 2016
Date of last renewal: 12 February 2021 

July 2021

Sheep Pour-ons and spot-ons
Pour-ons and spot-ons need to be applied accurately and each manufacturer may recommend subtle differences. Use appropriate and calibrated guns, always clean with warm soapy water and then rinse after use. Store in a safe dry place. When treating sheep with these products, make sure they are applied along the back line. If placed to one side, the product will not spread evenly around the body. No pour-on or spot-on is effective against sheep scab.

The Four Stroke Method: The four stroke method ensures the pour-on is applied evenly by applying a quarter of the application at a time in four simple strokes.

1) 1/4 applied from between the shoulders to middle of back
2) 1/4 applied from middle of back to top of animals tail
3) 1/4 applied from one side of the animals tail down the crutch
4) 1/4 applied from other side of tail down the other crutch

Cattle Pour-ons
These should be applied along the length of the flattest part of the animal’s back, from the withers to the tail head.
In general, animals should not be treated when the hair is wet or if rain is anticipated within two hours of treatment. However, some products are waterproof and can be used on wet animals.
Areas of damaged skin should be avoided, as should areas contaminated with mud or manure


What is deltamethrin?

Deltamethrin is an insecticide belonging to the pyrethroid family.
Pyrethroids are the man-made versions of pyrethrins, natural insecticides from chrysanthemum flowers.

Deltamethrin was first described in 1974 and entered the marketplace in 1978.
Deltamethrin is in a variety of products used to kill a wide range of insects.

How does deltamethrin work?

Deltamethrin can kill insects by direct contact or if they eat it.
It disrupts their normal nervous system function.
It is less toxic to mammals due to their higher body temperature, larger body size, and decreased sensitivity to the  chemical.

Delivery Information

Delivery Service

Here at Agridirect we have joined forces with DPD to ensure all packages are delivered promptly and safely to you. We ship to all mainland countries within the EU. Deliveries take place Monday to Friday excluding bank holidays. Once your order has been dispatched from our warehouse you will be notified by email. If there is a delay with your order for any reason you will be contacted immediately. 

Due to Brexit we are temporarily unable to ship to the UK. Shipping to Northern Ireland will remain in place.

Delivery Times
Ireland (ROI & NI) EU (Mainland Only)
2-4 Working Days 4-6 Working Days

Some products have an extended delivery time, this is noted on the products.

Delivery Rates

Country Orders Under €129 Orders Over €129
Ireland (ROI & NI) €7.99 €0.00
Austria €24.99 €17.00
Belgium €21.99 €14.00
Czech Republic €24.99 €17.00
Denmark €24.99 €17.00
Finland €36.99 €29.00
France €21.99 €14.00
Germany €21.99 €14.00
Hungary €28.99 €21.00
Italy €34.99 €23.00
Luxenburg €21.99 €14.00
Netherlands €21.99 €14.00
Poland €21.99 €17.00
Portugal €36.99 €29.00
Slovakia €28.99 €21.00
Slovenia €28.99 €21.00
Spain €34.99 €27.00
Sweden €34.99 €27.00


A selection of the products we sell are only licensed for sale within the Republic Of Ireland and can not be shipped outside of the country. These products are noted as only being available within the Republic of Ireland on the individual product pages.

There may be an addition charge on certain bulky items. This charge will be clearly marked on an applicable products and will be explained on the checkout page before payment has been made.

Agridirect Returns Policy

We’re sorry your purchase didn’t work out. But don’t worry; we have a great returns policy to help you out.

All purchases can be returned to us within 14 days of delivery and returned goods must be received within 14 days from the date you informed us of the return.

Purchases may be opened for inspection but must not be used and must be repackaged securely in the original packaging if you wish to return it.

If we discover goods have been used or there has been a loss in value of the goods due to damage to the goods, while in your care or whilst being returned to us, we will reduce the amount refunded, which may amount to the full cost of the product, to cover loss of value of goods.

All returns should be complete which includes boxes, manuals and accessories that may have been included with the order.

All returns must be packaged appropriately for shipping, we will not accept responsibility for damages or loss which occur during shipping of a return product.

We accept no responsibility for goods damaged or lost while in transit to us. 

How do I return a product?

We have partnered with DPD to make your returns process easy and secure. simply follow the steps below and bring your package to an official DPD pickup point.

1) All returns must be accompanied with a fully filled out returns form which can be downloaded here.

2) To print off your return label click here or visit and follow the on-screen instructions. Make sure and use your order number as your reference.

  • Select “Continue as Guest”
  • Select “Agridirect” from the drop-down menu
  • Select your reason for returning
  • Select the size of the package you wish to return
  • Accept DPD’s terms and conditions
  • Fill in your payment details
  • Fill in your own details
  • Follow the instructions to print off your label

3) Bring your package to a DPD pickup point. To find your nearest drop off point here.

Once the returned product has been received into our warehouse and been fully inspected a refund will be issued.

If you choose not to use the DPD returns service we recommend that you use a method that can be tracked.

For the return of bulk products please contact us at

I have received a damaged product from you, what should I do?

First off, if you have received a damaged electrical product from us, do not plug it in. Any electrical products that are plugged in are deemed ‘as used and accepted’ and are not accepted as returns. All damages must be reported to us via phone or email within 24hours of receipt of goods. Please ensure you check your items upon delivery.

How do I begin the returns process?

If you wish to begin the return process, please email us at and ensure the following information is included in your email. Your name, phone number, Order id, the item you wish to return, reason for return and if the product is damaged we require photos of the product.

Once you have sent us all required information a member of our team will assess your claim and will contact you as soon as possible. Please hold off on returning products until a member of our team has called you to confirm.


Once the returned product has been returned to us and fully inspected a refund will be issued.

Please Note: A typical timeline for a refund to show in your account is up to 10 working days from the date processed, depending on your bank.



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