Viper is a low-odour, water-based formulation that is easy to apply with the recommended applicator and to clean up after use. When using the product, wear cotton overalls over normal clothing, buttoned to the neck and wrist and a washable hat, PVC or rubber apron and chemical resistant gloves and water resistant footwear and face shield or goggles.

Extinosad Personal Protective Requirements Personal Protection Equipment Glasses
  • Use an applicator approved by Elanco. DO NOT use any other applicator.
  • Elanco 40mL applicator fitted with 6 hole T bar nozzle.
  • Genesis 60mL Power DoserTM fitted with a 6 hold T bar nozzle. Recommended operating pressure is 50-55 psi.
  • Determine the correct dosage according to bodyweight. Avoid underdosing or overdosing.
  • Weigh a representative sample of animals before treatment.
  • Dose to the heaviest animal in each mob.
  • If there is a large variation in size within the group (e.g. lambs), draft the group into two or more mobs and apply the correct dose rate for each weight range.
  • Wear cotton overalls over normal clothing, buttoned to the neck and wrist and a washable hat, PVC or rubber apron, chemical-resistant gloves, water-resistant footwear and face shield/ goggles when using Viper.
  • Apply to cleanly-shorn sheep within seven days of shearing or to unshorn lambs from two weeks to two months of age.
  • Apply using either the Elanco 40 mL applicator fitted with a 6 hole T Bar nozzle or a 60 mL Genesis Power Doser fitted with a 6 hole T Bar nozzle. The recommended operating pressure of the Power Doser is 50–55 psi.
  • For sheep <30 kg bodyweight, apply as a single broadband stripe from the poll to tail butt (see diagram below).
  • For sheep >30 kg, apply half the dose as two broadband stripes from the mid-neck to the butt of the tail, no further than 10 cm apart (see diagram below).
  • Viper contains a scourable blue dye to identify treated sheep.
  • Check all sheep at the end of each race to ensure correct application.
  • Retreat any sheep that have been missed or incorrectly treated.
  • Heavy rainfall (50 mm in one hour) before treatment and/or moderate rainfall (12.5 mm in two hours and/or 25 mm in 24 hours) after treatment will not adversely affect lice control provided by Viper. However, it is good agricultural practice not to treat animals when they are wet or if rain is likely.
  • Do not rehandle sheep for four weeks after treatment, unless wearing protective clothing as per label instructions.
  • Rinse applicator and draw-off lines in water after each day’s use.

Always read the label directions before use

Bodyweight (kg) Dose (mL) Method
6.1 - 8.0 12

Single Stripe : < 30kg

8.1 - 10.0 15
10.1 - 12.5 20
12.6 - 15.0 25
15.1 - 20.0 30
20.1 - 30.0 40
30.1 - 55.0 60

Double Stripe : > 30kg

55.1 - 80.0 80
80.1 - 100.0 90
Add 10mL for each 10kg avove 100kg.
Off-shears, and lambs 2 weeks to 2 months of age Wool 6 Months
Meat 42 Days
ESI 56 Days

Do not use on ewes which are producing or may in the future produce milk that may be used or processed for human consumption.