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Viper™ Pour-On

Viper 20L pack shot

Viper™ Pour-On

Viper™ contains thiacloprid which has a unique mode of action that provides rapid knockdown control of lice.² Viper continues to kill adult lice and emerging nymphs for 4 weeks after treatment when applied within 24 hours of shearing. Viper can be applied up to 7 days after shearing or to unshorn lambs from two weeks to two months of age. Elanco offer a 6 month off shears lice free guarantee.

Key Product Benefits:

  • Highly potent, second generation neonicotinoid chemistry 1,2,3
  • 4 weeks’ protection when applied within 24 hours of shearing
  • Flexible off-shears application – up to 7 days
  • 6 months off shears lice free guarantee

Pack size



Pour On

Viper™ Important Information

Find the information you need to incorporate Viper as part of your sheep lice management program. Always read and follow the label instructions.

Dosage and Administration

Always read and follow the label directions.

To apply Viper, only use an applicator approved by Elanco.

  • Elanco 40mL applicator fitted with 6 hole T bar nozzle.
  • Genesis 60mL Power DoserTM fitted with a 6 hole T bar nozzle. Recommended operating pressure is 50-55 psi.

DO NOT use any other applicator.

Withholding Periods

MEAT: DO NOT USE less than 42 days before slaughter for human consumption.

MILK: DO NOT USE on ewes which are producing or may in the future produce milk that may be used or processed for human consumption.

WOOL HARVESTING INTERVAL: DO NOT USE less than 6 months before shearing or fibre collection.

Export Slaughter Interval (ESI): DO NOT USE less than 56 days before slaughter for export.

Product label

Download Product Label

Please refer to the registered label for full directions of use.

Dosage Rates

Where to buy Viper™?

Viper 20L pack shot

Contact your local Elanco Representative to find your nearest store.

  1. BAH Laboratory Study 6106008 2006.
  2. BAH Laboratory Study 6108010 2008.
  3. BAH Laboratory Study 6105020 2005.