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Flectron Fly Tags (cypermethrin pyrethroid)
Flectron Fly Tags (cypermethrin pyrethroid)

Flectron Fly Tags (cypermethrin pyrethroid)

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Flectron Fly Tags are for the control of flies on cattle. Pack contains 10 ear tags and fastening studs, each ear tag has 935mg of cypermethrin pyrethroid. For Whole Body Protection.

Active Substance
cypermethrin pyrethroid

Target Species

Treats and Controls

Application Method
Ear Tag

Withdrawal Period

Each Ear Tag contains 935mg of cypermethrin pyrethroid

Key Features of Flectron Fly Tags

  • Effective up to 4 Months
  • Zero Withdrawal Period for Meat & Milk
  • Whole Body Protection

Directions For Fixing Flectron Fly Tags

Flectron Fly Tags should be applied to the ear using the Allflex® tagging system.

Using the Allflex® Application Pliers, position the fixing stud between the blood vessels, in a central area of firm tissue, halfway between the head and tip of the ear. Apply as follows:
  1. Place the ear tag under the clip by depressing the lever.
  2. Slide the male button onto the pin until it projects through the tip.
  3. Always dip into disinfectant solution. This helps prevent spread of infection, assists application and promotes healing.
  4. Centre, then apply through the ear half way between ear tip and head, taking care to avoid confusion with other ear marks

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

Flectron Fly Tags 935 mg

Each tag contains:
Active Substance: Cypermethrin (as Cypermethrin pyrethroid) 935 mg
For a full list of excipients, see section 6.1

Ear tag.
Heptagonal, amber, translucent tag with a pliable, dry, impregnated blotter type PVC resin.

4.1 Target Species

4.2 Indications for use, specifying the target species
For season long control of nuisance and biting flies including: Nuisance flies: Face fly (Musca autumnalis) Head fly (Hydrotea irritans) Biting flies: Horn fly (Haematobia irritans syn Lyperosia irritans) Stable fly (Stomoxys calcitrans) Cattle biting fly (Haematobia stimulans syn Haematobosca stimulans)

4.3 Contraindications
Do not use in cases of hypersensitivity to the active substance

4.4 Special warnings for each target species

4.5 Special precautions for use
Special precautions for use in animals


Special precautions to be taken by the person administering the veterinary medicinal product to animals- Rubber gloves should be worn when handling the fly tags.
- Tags should be removed before cattle leave the farm for slaughter.
- Do not burn, can produce harmful vapour.
- Wash hands and exposed skin before meals and after work.
- Avoid smoking when handling the fly tags. 

4.6 Adverse reactions (frequency and seriousness)
None known.

4.7 Use during pregnancy, lactation or lay
Can be used during pregnancy and lactation

4.8 Interaction with other medicinal products and other forms of interactions
None known

4.9 Amounts to be administered and administration route
Flectron eartags can control flies for up to 4 months when used as directed. 
For maximum benefit they should therefore be applied at the beginning of the season before fly populations build up. For complete control the entire herd should be tagged.
One tag per animal is usually sufficient to achieve acceptable levels of fly control. 
However, where head and face fly attack is very severe, two tags may be necessary, one on each ear.

Flectron eartags should be attached to the ear as follows:
Load stud and tag into the applicator according to the manufacturer's directions. 
Restrain the animal, preferably in a crush, so that the ear can be reached easily. 
Position the point of the fixing stud between the blood vessels in an area of firm tissue halfway between the head and the tip of the ear, with the fly tag on the back of the ear. 
A position between the second and third rib of the ear is ideal.
Depress the applicator until a click is heard. 
This means the tag and the fixing are firmly secured.

If a tag is lost during the season it is usually because of poor application. 
Flectron ear tags will remain flexible and active for a season.

Flectron ear tags are not recommended for fly control on cattle kept in feed lots or in animal housing.
Tags should be removed at the end of each fly season and before cattle go for slaughter. 
The neck of the stud behind the ear can be cut with round-nosed scissors. 
The new tag can be applied through the hole left by the previous one

4.10 Overdose (symptoms, emergency procedures, antidotes), if necessary

4.11 Withdrawal period(s)
Meat and offal: Zero days.
Milk:                 Zero hours.
Tags should be removed before cattle leave the farm for slaughter.

Pharmacotherapeutic group:

Ectoparasiticides for topical use, pyrethroids

ATCvet code: QP53AC08

5.1 Pharmacodynamic properties
The formulation for Flectron is devised so that the active ingredient, cypermethrin, is slowly released onto the surface of the tag. 
As the exposed chemical is removed, more cypermethrin is released onto the surface. 
Thus the tag acts as a constant reservoir of insecticide throughout the season.
The active ingredient is lipophilic and is thus strongly bound to the sebum or natural oil present in the animal's coat and on the surface of the skin. 
Natural body movements
- grooming and rubbing against other cattle
- transfer the insecticide onto the hairs of the coat. 
This disperses the active ingredient all over the animal, effectively giving the whole body protection against flies within 24 to 48 hours. 
The binding of the cypermethrin onto the sebum ensures a high degree of rain fastness.
Cypermethrin acts principally as a contact insecticide. 
Flies therefore have to come into contact with the chemical to be killed so it is normal to see a few on a tagged animal.
Flies landing on a tagged animal will pick up the insecticide on their feet or bodies. 
They then leave quickly as the chemical acts as a repellent. 
The flies normally leave before they have had time to bite, feed or otherwise annoy the animal. 
As the chemical on the flies is absorbed they become hyperactive and die within a few minutes.
Biting flies appear to be controlled more easily than nuisance flies, possibly because biting flies burrow under the hair, and thus pick up a lethal dose of cypermethrin on their bodies as well as on their feet.

5.2 Pharmacokinetic particulars Trials have shown that continuous release of active ingredient from the tag maintains adequate protection of the animal throughout the whole of the fly season - i.e. up to four months under temperate European conditions

6 PHARMACEUTICAL PARTICULARS 6.1 List of excipients LZC525 stabiliser Polyvinyl chloride Di-octyl adipate Filing stud (Polyether Polyurethane)

6.2 Major incompatibilities None known.

6.3 Shelf-life Shelf-life of the veterinary medicinal product as packaged for sale: 2 years.

6.4 Special precautions for storage Store in the original package. Keep the package tightly closed. Store below 25°C.

6.5 Nature and composition of immediate packaging 10 heptagonal tags packed in a plastic bag contained in an outer carton box.

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. Do not burn fly tags as they can produce harmful vapour. Harmful to bees and fish. Do not contaminate ponds, waterways and ditches with fly tags and containers. Health Products Regulatory Authority 10 June 2021 CRN00CCT1 Page 4 of 4

7 MARKETING AUTHORISATION HOLDER Zoetis Belgium S.A. 2nd Floor, Building 10 Cherrywood Business Park, Loughlinstown Co Dublin Ireland 8 MARKETING AUTHORISATION NUMBER(S) VPA10387/034/001 9 DATE OF FIRST AUTHORISATION/RENEWAL OF THE AUTHORISATION Date of first authorisation: 01 October 1999 Date of last renewal: 30 September 2009 10 DATE OF REVISION OF THE TEXT June 2021

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 Days4-6 Working Days

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

Delivery Rates

CountryOrders Under €99Orders Over €99
Ireland (ROI & NI)€6.99€0.00
Czech Republic€19.99€13.00


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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?

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

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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