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Deosect Spray

Deosect Spray Deosect Spray Deosect Spray
250ml Bottle 250ml Bottle 250ml Bottle
1 litre Bottle 1 litre Bottle 1 litre Bottle

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  • 250ml Bottle £35.95
  • 1 litre Bottle £74.95

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A powerful and effective residual insecticide, Deosect, produced by Zoetis, is specially developed for the control of flies and lice on donkeys and horses. Sweet itch horses can be plagued by midges.

Not suitable for use on any animals for human consumption. POM-VPS

Please note: As this is a flammable product it cannot be sent via Royal Mail so will incur a delivery charge.

We recommend you undertake a patch test before using on your donkeys and horses. Deosect must be diluted prior to use and according to the manufacturers instructions.

Below is the product datasheet. This has been provided by the manufacturer and should always be provided with the medication.


Pfizer Animal Health 2010
Company name: Pfizer Limited
Address: Ramsgate Road
Kent CT13 9NJ
Telephone: 0845 300 8034 (Out of hours: 01304 616161)
Fax: 01737 332521
Email: [email protected]
Website: www.pfizerah.co.uk


Cutaneous spray, solution.
Clear yellow liquid free from solids, containing Cypermethrin technical (cis 50: trans 50) 5.0% w/v (0.1% w/v when diluted).


Topical spray to control flies and lice on donkeys and horses

Dosage and administration

Deosect Spray must be diluted and mixed with water to make a solution just before use. A knapsack, hand sprayer or a sponge may be used to apply the solution. The solution should be used within 24 hours. Avoid spraying directly into animals eyes.
One litre (2 pints) of Deosect should be diluted with 50 litres (11 gallons) of water. Alternatively, the following table may be used:

Deosect Water
10 ml 500 ml
20 ml 1 litre
100 ml 5 litres
200 ml 10 litres

A medium fine spray is advisable to avoid fogging of the diluted Deosect Spray. Careful attention must be paid to total animal coverage, especially the face, legs, back and hind quarters. The following amounts should be used:
Adult horses – 500 ml of diluted solution per animal.
Ponies – 125 ml of diluted solution per animal.
Fly Control
The application of the solution should commence at the onset of the fly season and be repeated monthly for general fly control and every two weeks for severe head and face fly control.
Lice Control
Apply when lice are observed and repeat as necessary at a minimum interval of 14 days.

Contra-indications, warnings, etc

For animal treatment only.
For external use only.
Do not apply to any lesions where the skin is broken.
Do not spray in or near milking parlours or where milking machinery may be contaminated.
This product belongs to the pyrethroid group. Possible undesirable effects can be irritation and allergic reactions on the skin.
The product can be safely used during pregnancy and lactation.
Deosect spray is of low toxicity and acute poisoning is unlikely to occur.
Protection of operators
FLAMMABLE. Wear impermeable gloves, face shield and rubber boots when handling the concentrate, diluted liquid and when spraying animals.
Use in a well-ventilated area and avoid inhaling the spray mist. If splashed in the eye or on the skin, wash with plenty of clean, running water immediately and seek medical attention.
Remove contaminated clothing immediately and wash before re-use.
Do not smoke or eat while handling the product.
Wash hands and exposed skin after handling this product and before meals.
Withdrawal period
Not to be used in animals intended for human consumption. Treated horses may never be slaughtered for human consumption.
The horse must have been declared as not intended for human consumption under national horse passport legislation.
Shelf-life after dilution according to directions: 24 hours.
Protection of the Environment
Dangerous to fish and crustaceans. Do not contaminate ponds, waterways or ditches with the product or used containers.
Any unused veterinary medicinal product or waste materials derived from such veterinary medicinal products should be disposed of in accordance with local requirements.

Pharmaceutical precautions

Do not store above 25°C. Protect from frost.
Store in original container, tightly closed, in a safe place away from food, drink and animal feedstuffs.
Keep out of reach and sight of children.

Legal category


Packaging Quantities

1 litre or 250 ml oblong, unlined tin-plated mild steel can with a tin-plated mild steel cap (screw-fit).
Not all pack sizes may be marketed.

Further information


Marketing authorisation number

Vm 00057/4359.

Need help or advice? Contact us:

  • Landline: 01582 842096
  • Mon - Fri: 8:00am - 6:00pm
  • Sat: 9:00am - 1:00pm
  • Email: [email protected]

All prices include VAT where applicable.

Medication Datasheets

Reviews (104)

Summary of Reviews for Deosect Spray

Overall 5
Value For Money
Pet's Opinion
98 out of 104 (94%) customers would recommend this product.
5 stars (81 reviews)
4 stars (14 reviews)
3 stars (3 reviews)
2 stars (4 reviews)
1 stars (2 reviews)

Only verified purchasers of this product can leave a review.

55 Best flyspray
Verified Purchase

By on 8 September 2020

Best product I’ve used

Customer recommends this product

55 Late in the season
Verified Purchase

By on 30 August 2020

I bought this rather late in the season but it has been an easy trouble free answer to an age old problem. I have used once a week for the last 6 weeks and as this has been over the hottest part of the summer it has been great even for me not to be pestered by flies/midges when I collect him from the field. A definite cheaper easier method which I will start earlier in the season next year!

Customer recommends this product

55 Deosect Spray
Verified Purchase

By on 15 August 2020

A little difficult to open the bottle without spilling but a very effective fly spray which has left my three ponies immediately virtually fly free and the application is still working well two weeks later.

Customer recommends this product

55 Fly repellent
Verified Purchase

By on 10 August 2020

Deosect is easy to apply- we did bath them before we applied it, using a fly spray bottle. It seems to have worked well- my horses were out grazing while their field companions were hiding under a tree!!

Customer recommends this product

55 Deosect
Verified Purchase

By on 9 August 2020

Strong chemical smell but works fantastically well and really really lasts.

Customer recommends this product

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Q & A

Below are some recent questions we've received regarding Deosect Spray, including answers from our team.

17 April 2020 at 5:45pm

What other animals could use Deosect?

Hazel Norris

Could this product be used on other animals like Poultry, Emu's, donkey's, Alpaca's, Reindeer, wallabies, rabbits, guinea Pigs for insect control?

  • VioVet Staff

Hello Hazel,

This product is only licensed for use in horses. It is of POM-VPS category so if you want to use it in any other species, you will need to obtain a prescription from your vet.


Jessica M
Registered Animal Medicines Advisor.

20 July 2018 at 12:21pm

Bald and sore belly.


  • VioVet customer since 2011
  • From: Sir Benfro, United Kingdom

My sweetitch mare has large area's on her belly that are bald and some bits have broken skin. I know Deosect can't be applied on broken skin but is it worth me applying it to the rest of her this late? She wears a Boett 24/7 but the midges must be somehow getting to bite her belly as that's where it always starts.

  • VioVet Staff

Hello Sally

Thank you for your question.

This would be ideal to use still as long as you do not put it on her belly or any other broken skin.

Hope that helps.


10 June 2018 at 10:18pm

Is it safe to use on broodmare and foal?

Lucie P

Is Deosect safe to use on a broodmare with a one week old foal at foot?

  • VioVet Staff

Hello Lucie,

Thank you for your question.

The Deosect is fine to use around the foal, just make sure when spraying the horse you do not spray where the foal feeds from.

Hope that helps,


4 July 2016 at 8:53am

Deosect on clipped horses

Tanya Sanders

  • VioVet customer since 2012
  • From: West Midlands, United Kingdom

Can I use deosect on a clipped horse? My horse is half clipped and the flies are really bad at our yard so I need to apply deosect to him.

  • VioVet Staff

Deosect can be used as normal on a clipped horse (though should not be applied to anywhere that the skin has been cut). It you are just wanting to repel flies then you could consider one of the DEET containing products. They are usually very effective. (Examples would be the NAF OFF DEET products, but there are many others too on the website).

9 August 2015 at 1:15am

I would like ta know if deosect is safe to use for cats

Can in use deosect on my cats?

Can I use deosect on my cats?

  • VioVet Staff

This product is toxic to cats and should not be used on them!

18 May 2015 at 8:20pm

Can you use deosect on dogs to help against ticks?


My dog has come in with ticks nearly everyday for the past 2 weeks from our farm and I was wondering if deosect might help deter them? She's regularly spotted with advocate also.

  • VioVet Staff

Deosect is licensed for horses only, so in order to supply it for your dog, your vet would need to prescribe it for her and you send us the prescription. If this is something you'd like to speak to your vet about, we'd be more than happy to help you.

There are some other, non-prescription options that would be good to try first. I'd recommend trying the Scalibor Collar, which contains a similar potent repellent and insecticide. It offers up to 6 months protection and is much easier to use as it is just worn by the dog. Together with Advocate, I'd be very confident that your dog would be well protected. the collar would help to deter them from biting in the first place, and if they do, both products would result in a quick death of the tick. Most ticks should die and drop off but if not, they can be safely removed with a tick remover like this one.

Please get in touch if you have any further questions, I hope this has been helpful!

3 February 2015 at 5:15pm

My horse is very itchy


My horse is very itchy, can't see lice,mostly around her back and sides. Could you suggest what I could use. Was thinking deosect. Thanks

  • VioVet Staff

There are lots of possible causes of itching and only a few of them would be treated by Deosect. If there are lice present then Deosect is a good treatment but lice are not that difficult to spot. You should get a simple hand lens if possible and in good light, part the hair and look closely near the skin. Lice move about and can be seen if you look for a while. If you really cannot find any, it is most likely that lice are not the cause and there is no point in using Deosect.

You should try and get a diagnosis before attempting treatment. A visit from your vet might help identify a bacterial skin infection or suggest an allergy or something. Treatments can be very different for the different causes. Are there any other horses in contact with yours. Are they itchy? If in doubt, I suggest you call in your vet.

28 January 2015 at 9:31pm

How to help sweetitch with deosect


Hi our fell suffers with sweetich. Would you recomend deosect to help prevent outbreak. If so how often and are we OK use fly rug 24/7 with it ?. We also give garlic and veg oil with chaff. What would you recommend....

  • VioVet Staff

Deosect contains cypermethrin, a powerful insecticide that would
effectively kill the midges responsible for sweet itch. This product is
long lasting and can be applied every 2 weeks if needed, but applying
more frequently than this is not recommended. Deosect should only be
applied to healthy skin, and must not be applied to broken or sore skin.
A sponge is often the best method to applying around delicate areas and
the face.
I would use a strong insect repellent alongside it, such as NAF Off DEET Power, which can be re-applied as often as needed. NAF also do a very good D-Itch Ointment which can be applied to affect areas up to twice a day to soothe irritation while acting as a barrier and repellent.
Aside from this, I would avoid turning your horse out at dawn and dusk,
which is peak feeding time for midges. Also try to avoid grazing near
standing water, old water troughs and boggy fields and away from moist
muck heaps. If he has trouble with midges in his stable, mounting a fan
should help as they are very weak fliers and will find it more difficult
to land and feed.
I hope you will find these suggestions helpful, please get in touch if we can help further.

7 November 2014 at 6:40pm

Cob itching

Cob with itchy legs

Does this kill leg mites my poor horse keeps itching rubbing his legs

  • VioVet Staff

Deosect is not the usual treatment for leg mites in horses. There are other causes of itchiness affecting a horse like this, but mites are very possible. The most common treatment would be to clip off all the feathers, shampoo the affected area to remove all dirt and scabs if present, then use a topical treatment with activity against mites. LimePlus Dip is the product usually sold for this. Tretment once per week for 4 weeks might be needed. It is also common for some horses to have mites but show no signs but to carry them and then pass them on to the treated horse later. Ideally you should ask your vet to perform skin scrapings to check if mites are the cause. Your vet could prescribe Frontline Spray to treat them. That is usually effective too, but needs a prescription. LimePlus Dip isquite smelly, but is safe and is as effective as any other treatment.

9 June 2014 at 2:05pm

Application interval on bathed horses

Lindsey Roberts

I'm looking for an effective fly repellent for my horses that are in regular work so are washed on an almost daily basis. Does this product need to be reapplied every time the horse is bathed?
Lindsey Roberts

  • VioVet Staff

This product has some persistence when horses are washed, but it is not documented how effective this is. I do not think that you should apply it as often as every day, though you could certainly apply it every 2 weeks. You would hope to be able to observe how well it seems to work, then notice when the effect is wearing off. If it is not adequately effective, you could alternate between this product and one of a completely different nature. (The compound DEET is often regarded as the most powerful insect repellent and this would be my observation too. It is available in products like "NAF Off DEET Power" which is also a good product.)

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