Symptoms of a worm or parasite infection can be quite varied and dependent on the type and number present in a horse. A complicating factor is that a horse may not present with symptoms until the parasite burden is high. Some typical symptoms of worms or parasites include:  Itching Weight loss Reduced appetite Colic Lethargy Susceptibility to infections Pneumonia  All articles Understanding-equine-worms

AbFen (Fenbendazole) AbFen (Fenbendazole) is an equine dewormer formulated to treat parasites that can damage a horse’s gastro-intestinal and respiratory tracts. Fenbendazole is a broad spectrum benzimidazole anthelmintic used against gastrointestinal parasites including giardia, roundworms, hookworms, whipworms, the tapeworm genus Taenia, pinworms, aelurostrongylus, paragonimiasis, strongyles, and strongyloides.  AbIver (Ivermectin) AbIver (Ivermectin) is a broad spectrum dewormer. Ivermectin are macrocyclic lactones derived from the bacterium Streptomyces avermitilis. Ivermectin kills by interfering with nervous system and muscle function, in particular by enhancing inhibitory neurotransmission.

A Fecal Egg count (FEC) is the best way to measure the number of strongyly or tapeworms per gram of manure. A fecal egg count measures the number of strongyle eggs your horse is passing in each gram of his manure. The content of this article should not be considered, or used as a substitute for, veterinary medical advice, diagnosis or treatment. 

Large Redworms (Strongylus vulgaris) Description One of the most dangerous internal parasites but fortunately are much less common now due to the use of chemical wormers.  Migrate through the blood vessels of the intestine causing significant bleeding and damage. Symptoms Rapid weight loss Diarrhoea Surgical colic Small Redworms (Cyathostomin spp.) Description Most common internal parasite in horses.  The ingested larvae burrow into the gut lining; they will either continue to develop or, in the winter months, they will hibernate in the gut wall.

Resistance to worming treatment is an increasing concern amongst horse owners. Resistance occurs because a very small percentage of worms always had a genetic ability to survive chemical treatment; a strategic approach to worming is important to minimise the risk of resistance occurring. Reasons for resistance: Worming too frequently can increase chances of resistance.  Under-dosing or using the incorrect active ingredient can increase chances of resistance  If an infestation of worms is not exposed or affected by treatment, resistance amongst this population can occur slowly over time.

NOTE: As of 1st July 2021- AbDewormers are is no longer in production - Product is discontinued - No longer available for sale.   AbFen (Fenbendazole) Dosage For information about the correct dosage rates for AbFen: Review AbFen Product Fact Sheet AbIver (Ivermectin) Dosage For information about the correct dosage rates for AbIver: Review AbIver Product Fact Sheet AbIver Plus (Ivermectin & Praziquantel) Dosage For information about the correct dosage rates for AbIver Plus: