Virbac Australia


FIRSTMECTIN® for sheep and lambs

For the treatment and control of abamectin sensitive strains of internal parasites (including benzimidazole, levamisole, and morantel resistant strains), nasal bot and itch mite in sheep and lambs. For treatment and control of tapeworm in sheep and lambs.

  • Sheep
  • Australian made
    Australian made


  • A combination oral drench for sheep and lambs
  • Contains abamectin
  • Contains praziquantel
  • Broad spectrum parasite control, including tapeworms
  • Ideal for lambs
  • Unselenised


Control of roundworms and tapeworm concurrently.


  • Contains abamectin in combination with praziquantel

    Abamectin is a potent, short acting member of the macrocyclic lactone (ML) family of drenches. Praziquantel is the only chemical that controls both segments and heads of tapeworm. It makes sense to remove tapeworms to reduce the overall worm burden of your lambs, giving them the best opportunity to achieve peak performance.

  • Broad spectrum parasite control

    FIRSTMECTIN is highly effective against abamectin sensitive gastrointestinal roundworms, lungworm, nasal bot and itch mite. It also provides control of tapeworms (heads and segments).

  • Ideal for lambs

    For a young lamb, life is a risky business. They’re vulnerable to cold, predators and worms. As soon as lambs start to eat pasture, they are developing a worm burden. Unlike older sheep, lambs haven’t built up their immunity against worms. Worm infections lead to reduced wool production and lower bodyweights in sheep of any age; a high worm burden will have a far bigger impact on young sheep.

  • Unselenised

    Excess selenium can cause toxicity issues in sheep, particularly if they are suffering liver damage from eating particular weeds. Where sheep are receiving sufficient amounts of selenium in their diet, it may be better to use an unselenised drench. If selenium supplementation via a drench is required, FIRSTMECTIN® SE is recommended.


  • Abamectin 0.8g/L
  • Praziquantel 15g/L


FIRSTMECTIN is given orally at the recommended dose of 1mL/4kg bodyweight.

Bodyweight Dose Volume Sheep Treated
(kg) (mL) 10L
11-15 4 2500
16-20 5 2000
21-30 7.5 1333
31-40 10 1000
41-50 12.5 800
51-60 15 666
61-70 17.5 571
71-80 20 500

Animals in excess of 80kg bodyweight to be dosed at 1mL/4kg.


  • Meat: 14 days
  • Milk: When milk or milk by-products are to be used for human consumption DO NOT ADMINISTER to dairy sheep within 28 days prior to lambing or during lactation
  • ESI: 28 days


Store below 30°C (room temperature) in original container.


Liquid: 10L

Download product SDS 


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