Lockout teat sealant aids in the prevention of new intramammary infections.


Like existing teat sealants, LOCKOUT simulates the keratin plug to seal the teat against bacteria. However, LOCKOUT offers several significant enhancements, including a more ergonomic syringe design and a blue paste that's easy to identify upon removal.


Learn how to properly administer and remove LOCKOUT in a step-by-step video, available in English and Spanish. Downloadable how-to guides are also available. 

Product Description


LOCKOUT aids in the prevention of new intramammary infections by providing a malleable barrier in the teat canal.

  • LOCKOUT teat sealant simulates the keratin plug, the cow’s natural first line of defense, to seal the teat against bacteria.
  • Provides a sterile, antibiotic-free barrier between the udder and the environment.
  • It is recommended that LOCKOUT be used as part of a herd approach to mastitis control.
  • Compatible with conventional dry-cow management practices.
  • Safe for use in non-lactating dairy cows and requires no milk or pre-slaughter withdrawal. If antibiotics are used, follow recommended withdrawal times.

Features & Benefits


  • Visible Blue Paste
    • The first sealant to feature a paste that's easy to distinguish from milk during removal.
  • Compact and Comfortable
    • The same amount of product in a smaller tube with a larger thumb pad.
  • Easy Pull-Off Cap
    • Just pull the cap straight off. No need to twist or turn.
  • Short Plunger Stroke
    • A quick half-inch plunger stroke is all it takes to administer a full 4-gram dose per teat. 

Presentation and Dosage

  • LOCKOUT is available in single-dose syringes, containing 4 grams of a sterile, non-antibiotic blue paste composed of 60% bismuth subnitrate in a mineral oil vehicle. Each syringe is sufficient for one teat.
  • One pail of LOCKOUT contains 144 syringes for the treatment of 36 animals.


INDICATIONS:  LOCKOUT aids in the prevention of new intramammary infections.

Begin by ensuring each quarter has been completely milked out.

Proper hygiene is crucial. Remember to keep syringes clean, and replace or disinfect disposable gloves between each cow or when soiled. DO NOT immerse syringes in water prior to use.

Dip teats with germicidal solution. Allow 30 seconds contact time. Dry each teat with a clean towel.

Disinfect teat ends by scrubbing each teat end with a 70-percent-alcohol-soaked pad, starting on teats farthest away.

Apply dry cow therapy using partial-insertion technique, starting on the closest teat (opposite order of cleaning). Massage dry treatment into each quarter.

Scrub each teat end with a 70-percent-alcohol-soaked pad, starting on teats farthest away.

Remove the cap from the LOCKOUT non-antibiotic internal teat sealant tube, being careful to not touch the tip and maintain proper hygiene.

Infuse teats in the opposite order to cleaning. (I.e., treat the quarters nearest to you first)

Pinch the teat where it joins the base of the udder. This helps position the LOCKOUT paste in the teat canal.

Apply LOCKOUT using partial-insertion technique, starting on the closest teat (opposite order of cleaning). NOTE the plunger only travels one half inch.

Deposit a small quantity of sealant in the teat canal as you remove the syringe. DO NOT massage LOCKOUT teat sealant into the udder.

Apply a post-milking teat disinfectant.



DO NOT remove LOCKOUT by action of milking machine.

At calving thoroughly hand-strip every teat 10 to 12 times, beginning at the top of the teat and working down prior to milking.*

Identification: LOCKOUT is the first non-antibiotic internal teat sealant to feature a visible blue paste that’s easy to distinguish from milk during removal.

Remove milk from fresh cows for a minimum of three milkings per normal post-calving procedure.

*Dispose of any unused product or sealant stripped from an animal in accordance with federal, state, and local requirements.

Safety Information

WITHDRAWAL INFORMATION:  For use in dry dairy cows and replacement dairy heifers only. If accidentally administered to a lactating cow, product can be stripped out by hand. If LOCKOUT is administered following an antibiotic infusion, the withdrawal periods for meat and milk for the antibiotic must be observed. LOCKOUT has a zero-day milk and meat withdrawal when used alone.

USER SAFETY WARNINGS:  Not for use in humans. Keep out of the reach of children. If LOCKOUT gets on skin, wash with soap and warm water. For additional safety information, consult the safety data sheet (SDS).

STORAGE:  Store at room temperature, 60°-85°F (15°-30°C). In very cold temperatures, LOCKOUT may become difficult to administer and should be warmed to room temperature.

LOCKOUT® is a registered trademark of Boehringer Ingelheim Animal Health USA Inc. 
©2019 Boehringer Ingelheim Animal Health USA Inc. Duluth, GA. All Rights Reserved. US-BOV-0051-2019