Jeffers Ivermectin Horse Dewormer (1.87%) Limit 30 per customer A broad-spectrum dewormer for horses used to aid in the control of large & small strongyles, pinworms, lungworms, roundworms, bots and more. This new gel formula treats up to 1250 lbs in body weight, kills internal parasites and helps control 46 species and stages of worms and bots. Aids in the Control of: large and small strongyles pinworms hairworms threadworms stomach worms lungworms roundworms All horses should be included in a regular parasite control program with particular attention paid to mares, foals, and yearlings. Foals should be treated at 6-8 weeks of age and routine treatment repeated as needed. Consult a veterinarian for a control program to meet specific needs. Note: May be used in horses of all ages, including mares at any stage of pregnancy. Stallions may be treated without adversely affecting their fertility. Any use of a product that is not clearly defined on the label directions should be done only under the supervision of a qualified veterinary professional.