Dysect Sheep Pour-on Solution 12.5 g/l

Composition

Each litre contains:

Active substance:

Alphacypermethrin 12.5 g

Excipients:

Clear dark green liquid free from solids.

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Pharmacological properties

4.1 ATCvet code: QP53AC08

Ectoparasiticides; insecticides and repellents; pyrethrins; cypermethrin. Alpha-cyanopyrethroids.

Mechanism of action inhibits neural transmission in insects.

4.2 Pharmacodynamics

Alphacypermethrin is a synthetic pyrethroid, which works as an insecticide and repellent by inhibiting neural transmission in insects.

4.3 Pharmacokinetics

Alphacypermethrin is lipophyllic and is retained in the wool grease of the sheep fleece to provide protection from blowflies for up to 8 to 10 weeks.

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Target species

Sheep.

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Indications

For the control and treatment of blow fly strike, on sheep and lambs and for the treatment of lice and ticks on sheep. Reduces the incidence of headfly strike in sheep and lambs for up to 6 weeks.

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Dosage

The veterinary medicinal product is applied at a rate of 40 ml for animals weighing 25 kg or more, and 25 ml for animals weighing less than 25 kg. The dose is applied using an adjustable dosing gun fitted with a T-bar with 3 or 4 outlets and is applied directly onto the wool in a band from the back of the head to the base of the tail. For the reduction of headfly strike 5 ml per animal is applied between the horns, irrespective of size of the animal.

Blowfly - For the control of blowfly a single application will normally provide 8 to 10 weeks protection. Re-treatment may be necessary after this period. For the treatment of blowfly strike, a single treatment applied to the infected area will ensure blowfly larvae are killed.

Ticks - A single treatment will normally provide control of ticks for 8 to 12 weeks.

Headfly - A single treatment will reduce the incidence for up to 6 weeks.

Lice - A single treatment will normally kill all lice.

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Contraindications

Do not treat lambs under one week old.

Do not treat animals in very hot weather.

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Adverse reactions

Sheep:

Very rare (<1 animal / 10,000 animals treated, including isolated reports): Fleece discolouration1

1 Observed from approximately 6 to 8 weeks after treatment.

Reporting adverse events is important. It allows continuous safety monitoring of a veterinary medicinal product. Reports should be sent, preferably via a veterinarian, to either the marketing authorisation holder or the national competent authority via the national reporting system. See the package leaflet for respective contact details.

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Warnings

Special precautions for safe use in the target species:

For external use only.

Because alphacypermethrin is retained in the wool grease of the fleece, it is recommended that the product be applied to sheep with a minimum wool length of 1.0 cm.

Special precautions to be taken by the person administering the veterinary medicinal product to animals:

Personal protective equipment consisting of waterproof apron, boots, and impervious gloves should be worn when handling the veterinary medicinal product and recently treated animals.

Use the product in a well-ventilated area.

Wash any splashes from the skin and eyes immediately, using plenty of water. Remove heavily contaminated clothing immediately and wash before re-use. Wash hands and exposed skin with soap and water after treatment and before eating drinking and smoking.

Special precautions for the protection of the environment:

Not applicable.

3.11 Special restrictions for use and special conditions for use, including restrictions on the use of antimicrobial and antiparasitic veterinary medicinal products in order to limit the risk of development of resistance

Not applicable.

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Use during pregnancy, lactation or lay

Pregnancy and lactation:

The safety of the veterinary medicinal product has not been established during pregnancy and lactation.

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Interactions

None known.

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Overdose

No adverse reactions were recorded in double dose exposure trials.

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Special warnings

None.

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Withdrawal period

Meat and offal: 49 days.

Milk: Not permitted for use in animals producing milk for human consumption.

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Incompatibilities

None known.

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Immediate packaging

Container: Fluorinated HDPE backpack dispenser of 2.5 litre and 5 litre content. Closure: Aluminium overseal with polyethylene foam wadding and a polypropylene cap.

Dosing device: Pour-on applicator with a glass filled nylon body and polypropylene barrel.

Not all pack sizes may be marketed.

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Storage

Do not store above 25 °C.

Do not freeze.

If contents freeze, they must be thawed and thoroughly mixed before use.

Store in the original container.

Keep the container tightly closed.

Store in a dry place.

Protect from direct sunlight.

Store away from food, drink, and animal feeding stuffs.

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Shelf life

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

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Disposal of unused product

Medicines should not be disposed of via wastewater.

DANGEROUS to fish and aquatic life. Do not contaminate ponds, waterways or ditches with the product or empty container.

Use take-back schemes for the disposal of any unused veterinary medicinal product or waste materials derived thereof in accordance with local requirements and with any national collection systems applicable to the veterinary medicinal product concerned.

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Additional information

Vm 42058/5160

8 DATE OF FIRST AUTHORISATION

10 December 1999

9 DATE OF THE LAST REVISION OF THE SUMMARY OF THE PRODUCT CHARACTERISTICS

October 2025

10 CLASSIFICATION OF VETERINARY MEDICINAL PRODUCT

Veterinary medicinal product subject to prescription.

Find more product information by searching for the ‘Product Information Database’ on www.gov.uk.

Approved: 06 January 2026

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Registration holder

Zoetis UK Limited

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