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Y-Tex PYthon Magnum Insecticide Cattle Ear Tags

This page contains information on Y-Tex PYthon Magnum Insecticide Cattle Ear Tags for veterinary use.
The information provided typically includes the following:
  • Y-Tex PYthon Magnum Insecticide Cattle Ear Tags Indications
  • Warnings and cautions for Y-Tex PYthon Magnum Insecticide Cattle Ear Tags
  • Direction and dosage information for Y-Tex PYthon Magnum Insecticide Cattle Ear Tags

Y-Tex PYthon Magnum Insecticide Cattle Ear Tags

This treatment applies to the following species:
Company: Y-Tex

- 1 tag/head treatment for Beef and Dairy Cattle (including Lactating Dairy Cows)

- Controls most strains of Horn Flies for up to 4 months and pyrethroid-susceptible strains of Horn Flies for up to 5 months

- Aids in control of Face Flies, Stable Flies and House Flies for up to 4 months

- Controls Biting Lice and aids in control of Sucking Lice for up to 3 months

Keep Out of Reach of Children

Y-Tex PYthon Magnum Insecticide Cattle Ear Tags Caution


Zetacypermethrin, S-enantiomer
S-cyano (3-phenoxyphenyl) methyl (±) cis/trans 3-(2, 2-dichloroethenyl)-2, 2 dimethylcyclopropane-carboxylate*


*Cis/trans isomer ratio: Max. 55% (±) cis and Min. 45% (±) trans

Piperonyl Butoxide
(butylcarbityl) (6-propylpiperonyl) ether and related compounds






- 1 tag per head controls horn flies and aids in control of face flies, stable flies, and house flies.

- 1 tag per head controls biting lice and aids in control of sucking lice.

- Approved for lactating dairy cows.

- Synergized for maximum effectiveness against horn flies and other pests.

- Guaranteed against loss due to tag or button failure for 5 months.*

- No meat or milk withdrawal time required.

Snap-Lok® collar for superior retention*

Ribbed design for season-long durability

Long taper and rounded edges for durability

Large surface area for insecticide effectiveness


* This guarantee is a limited guarantee, limited to the replacement of tags only, if the tags failed after being properly applied, to remain in the animal’s ear for a five (5) month period due to tag breakage or separation from button.

Directions For Use

It is a violation of Federal law to use this product in a manner inconsistent with its labeling. The labeling must be in the possession of the user at the time of pesticide application.

Apply one (1) tag per head to the front or back of one ear on each animal to control most strains of horn flies and to aid in the control of face flies, stable flies and house flies for up to 4 months. Tags remain effective against pyrethroid-susceptible strains of horn flies for up to 5 months. Apply when flies appear in the spring. For lice protection through winter, apply one (1) tag per head in late fall or early winter. Controls biting lice and aids in the control of sucking lice for up to 3 months.

Apply as shown with the Y-TEX UltraTagger. All mature and weaned animals in the herd should be tagged to avoid dilution of the treatment. Calves under 3 months of age should not be tagged or ear damage may result. For optimum pest control on Brahman-type cattle with large ears, apply tags to the back of the ear. To minimize development of insecticide resistance, remove used tags at end of fly or lice season, and follow the Y-TEX recommended tag rotation program involving organophosphate tags.

Step 1

Seat male button firmly on pin, press down and give a slight twist.

Step 2

Place female tag firmly under clip. Collar on tag must be pointing away from pin.

Step 3

Position applicator over ear and squeeze the handles together.

The ideal position for male stud is between the second and third radial cartilage as shown.

Storage And Disposal

Do not contaminate water, food, or feed by storage or disposal.

PESTICIDE STORAGE: Store in a cool place in original container, away from direct sunlight. Opened bags containing ear tags should be resealed for storage.

PESTICIDE DISPOSAL: Remove tags before slaughter. Securely wrap used tags in a plastic bag or several layers of newspaper and discard in trash.

CONTAINER DISPOSAL: Non-refillable container. Do not reuse bag. Discard bag in trash, or offer for recycling if available.

First Aid

This product contains zetacypermethrin, a pyrethroid insecticide, and piperonyl butoxide, technical, a mixed-function oxidase inhibitor.

If swallowed

• Call a poison control center or doctor immediately for treatment advice.

• Have person sip a glass of water if able to swallow.

• Do not induce vomiting unless told to do so by a poison control center or doctor.

• Do not give anything by mouth to an unconscious person.

If on skinor clothing

• Rinse skin immediately with plenty of water for 15-20 minutes.

• Call a poison control center or doctor for treatment advice.

If in eye

• Hold eye open and rinse slowly and gently with water for 15-20 minutes.

• Remove contact lenses, if present, after the first 5 minutes, then continue rinsing eye.

• Call a poison control center or doctor for treatment advice.

If inhaled

• Move person to fresh air.

• If person is not breathing, call 911 or an ambulance, then give artificial respiration, preferably mouth to mouth, if possible.

• Call a poison control center or doctor for treatment advice.

Hot Line Number

Have the product container or label with you when calling a poison control center or doctor, or going for treatment. You may also contact 1-800-255-3924 for emergency medical treatment information.

Precautionary Statements


Y-Tex PYthon Magnum Insecticide Cattle Ear Tags Caution

Harmful if swallowed. Wear long-sleeved shirt, long pants, socks, shoes, and rubber or non-permeable protective gloves when applying tags.

Follow manufacturer’s instructions for cleaning/maintaining personal protective equipment (PPE). If no such instructions for washables exist, use detergent and hot water. Keep and wash PPE separately from other laundry.

Notice Of Warranty

To the extent consistent with applicable law, Y-TEX CORPORATION MAKES NO WARRANTY OF MERCHANTABILITY, FITNESS FOR ANY PURPOSE, OR OTHERWISE, EXPRESSED OR IMPLIED concerning this product or its uses which extend beyond the use of the product under normal conditions in accord with the statements made on the label, and in any case, is limited to replacement of tags only.

Environmental Hazards

This pesticide is extremely toxic to fish and aquatic invertebrates. Do not contaminate water by disposal of used tags. Use this product only as specified on the label.

User Safety Recommendations

•User should wash hands before eating, drinking, chewing gum, using tobacco, or using the toilet.

•User should remove clothing/PPE immediately if pesticide gets inside. Then wash thoroughly and put on clean clothing.

•Users should remove PPE immediately after handling this product. Wash the outside of gloves before removing. As soon as possible, wash thoroughly and change into clean clothing.

EPA EST. NO. 39039-WY-01

EPA REG. NO. 39039-11






0.54 oz. (15.4 GRAMS) PER TAG



0.54 oz. (15.4 GRAMS) PER TAG




CPN: 1344010.2

Telephone:   800-443-6401
THIS SERVICE AND DATA ARE PROVIDED "AS IS". DVMetrics assumes no liability, and each user assumes full risk, responsibility, and liability, related to its use of the DVMetrics service and data. See the Terms of Use for further details.

Copyright © 2023 Animalytix LLC. Updated: 2023-05-29