Producer preparing to administer Lockout teat sealant for dry cows. Producer preparing to administer Lockout teat sealant for dry cows.


A Safe & Effective Defense Against Bacteria

Lockout® (bismuth subnitrate) simulates a cow’s natural first line of defense, the keratin plug, to seal the teat against harmful bacteria by providing a sterile, antibiotic-free barrier between the udder and its environment. It is compatible with conventional dry‑cow management practices, and labeled for use in dry dairy cows and replacement heifers. LOCKOUT requires no milk or pre-slaughter withdrawal. If antibiotics are used, follow recommended withdrawal times.


This 9-step process includes the administration of a dry off treatment followed by a teat sealant.

Ensure each quarter is completely milked out. When using an antibiotic at dry-off, administer first according to the label. slide-image
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. slide-image
Dip teats with germicidal solution. Allow 30 seconds of contact time. Dry each teat with a clean towel. slide-image
Scrub each teat end with a 70-percent alcohol-soaked pad, starting on teats farthest away. slide-image
Remove the cap from the LOCKOUT nonantibiotic internal teat sealant tube, being careful not to touch the tip and to maintain proper hygiene. slide-image
Pinch the teat where it joins the base of theudder. This helps position the LOCKOUT paste in the teat canal. slide-image
Apply LOCKOUT using partial-insertion technique, starting on the closest teat (opposite order of cleaning). NOTE the plunger only travels one-half inch. slide-image
Deposit a small quantity of sealant in the teat canal as you remove the syringe. DO NOT massage LOCKOUT teat sealant into the udder. slide-image
Apply a post-milking teat disinfectant. slide-image


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


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


Three easy steps to removing LOCKOUT after calving.

Do not remove LOCKOUT with a milking machine. At calving, thoroughly handstrip every teat 10 to 12 times, beginning at the top of the teat and working down prior to milking.* slide-image
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. If you see blue, there is more teat sealant to remove. slide-image
Milk fresh cows into a bucket for a minimum of three milkings, according to post-partum procedures. See important withdrawal information below. slide-image