Ultra Boss


Merck Ultra Boss topical insecticide is for use on horses, cattle, and sheep.  It is effective against flies, lice, mosquitos and ticks.

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This product is manufactured by Merck Animal Health.

Active Ingredients:  Permethrin

Directions for User:  For horses and ponies, wearing rubber gloves apply approximately 30mL to a soft cloth.  Rub horse’s shoulders, neck, underside of belly and legs.  Repeat every 2-3 days.

Precautions:  Do not pour product directly onto skin, as this may cause temporary hairless.  Keep away from other animals and children.

Additional information



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