Wormers

Wormers

Choosing the right sheep wormer depends on the parasite species present, your stock's age (lambs versus adult sheep), your worming protocol, and the active ingredients best suited to the animal’s condition. Effective sheep wormers must address common parasites including roundworms, tapeworms and coccidia. 

Consider whether you need an oral sheep wormer (drench), injectable treatment, boluses or combination therapy. Review your flock's worming history and speak with your vet if resistance is a concern. Select from trusted brands and follow the correct dosing guidance for your sheep's weight. Compare sheep wormers below to find the best option for your worming programme.

Frequently Asked Questions About Sheep Wormers

What Type Of Sheep Wormer Should I Choose?

Choose based on parasites present, flock age (lambs vs adults), worming protocol, and administration preference. Oral drenches suit regular handling; injections work for animals who may have difficulty drenching and offer systemic control; boluses provide longer-lasting protection with less frequent dosing. Always consult your vet to confirm parasites and select the best sheep wormer for your situation.

What Is The Difference Between Sheep Drenches And Injectable Wormers?

Sheep drenches deliver anthelmintics by mouth and suit flocks you handle regularly. Injections work systemically through the bloodstream, suit animals who may be more difficult to drench, and offer broader parasite coverage. Injectable sheep worming medicine costs more per dose on average but provides longer-lasting protection and reduces handling stress. Choose based on flock size, facilities, and administration preference.

What Parasites Do Sheep Wormers Control?

Effective sheep wormers target roundworms (most common and damaging), tapeworms (less common but significant), and coccidia (affecting young lambs). Different active ingredients target different parasites, so choice depends on which parasites are confirmed in your flock and whether your flock has a history of resistance to certain active ingredients. Your vet can identify parasites through faecal egg testing and recommend the appropriate sheep worming medicine or broad-spectrum anthelmintic.

How Often Should I Deworm My Sheep?

Frequency depends on flock age, grazing system, local parasite burden, and regional resistance patterns. Lambs need more frequent worming than adults, especially in spring and early summer. Some farms use targeted selective worming (treating only affected animals identified via faecal testing), while others follow fixed schedules. Consult your vet to develop a tailored sheep worming schedule for your system and region.

What Are Sheep Worming Boluses?

Sheep worming boluses are solid, long-acting formulations placed in the mouth and swallowed, releasing the active ingredient gradually over weeks or months. A single bolus provides 8-12 weeks of continuous anthelmintic protection. Boluses suit flocks wanting extended protection and reduce repeat drenching frequency and handling stress. Follow product instructions for age and weight requirements.

Can Parasite Resistance To Sheep Wormers Develop?

Yes. Anthelmintic resistance in sheep parasites is a growing UK concern. Repeated use of the same active ingredient selects for resistant parasites. Manage resistance by: rotating anthelmintic groups, conducting faecal egg testing before treatment, avoiding unnecessary worming, and following dosing carefully. Leaving some animals untreated maintains susceptible parasite populations (refugia strategy). Consult your vet on local resistance patterns and develop a resistance management strategy.

Choose Effective Sheep Wormers for Parasite Control

Mole Avon stocks sheep wormers from leading veterinary brands, including oral drenches, injectable anthelmintics, boluses and combination treatments for lambs and adult sheep. All sheep worming products meet UK veterinary standards and are sourced to ensure product efficacy and flock health. 

Order online for UK delivery, or collect from your nearest Mole Avon store. If you need guidance on the best sheep wormer for your flock or advice on worming strategy, get in touch.