Drenches or anthelmintics continue to play a major role in worm control in sheep. However, resistance to drenches is widespread and getting worse. Drenches should be used well and in combination with other worm control strategies.

This Primefact is an overview of the different drench types available. It also includes a list of drenches currently registered for use in sheep in New South Wales as at April 2006. Not all registered drenches will be available. Check with your supplier. Note that most drenches are not registered for use in goats. Such drenches can only be used in goats if you have written directions from a veterinarian.

Contents include:

• Broad-spectrum drenches
• Narrow-spectrum drenches
• Choosing and using a drench - general principles
• Table 1. Registered sheep drenches - NSW
• Table 2. Activity of drench types in susceptible worm populations
• Table 3. Drench costs - a rough guide
• Table 4. Long-acting drenches - options