Ivermectin Paste 1.87% by Durvet is a preloaded syringe oral wormer for horses. Each tube will worm a horse up to 1250 pounds. Ivermectin Paste removes worms and bots in a single dose. The syringe is marked at 250 pound intervals for easy calculation of how much to administer. The wormer is apple flavored and is effective in removing Large Strongyles and Small Strongyle, Pinworms, Ascarids, Hairworms, Large-mouth Stomach Worms, Bots, Lungworms, Intestinal Threadworms and for summer sores and dermatitis caused by Neck Threadworm Microfilariae. Ivermectin is safe for horses of any age and pregnant mares. Ivermectin Paste Wormer has been one of the standard horse wormers for many years.