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Acetylcysteine is a mucolytic that is used in human medicine to decrease the viscosity of respiratory secretion, particularly in patients with cystic fibrosis. It has a number of uses in veterinary medicine, including the treatment of acetaminophen toxicity of dogs and cats, intra-uterine treatment in mares, meconium impaction in foals, and as an adjunct in the treatment of Keratoconjunctivitis Sicca (KCS) and corneal ulcers.
Acetylcysteine may be administered intravenously or orally in the treatment of acetaminophen poisoning. It may also be nebulized, used topically on the eye, or instilled in the rectum or uterus.
When acetylcysteine is used as a mucolytic in the respiratory tree, GI tract, or uterus, the mechanism of action is through disruption of the disulfide bonds in mucin. This decrease in viscosity of the mucous secretion allows for more efficient clearance. When acetylcysteine is used topically for the treatment of corneal ulceration, the primary mechanism of action is through the inhibition of proteases and collagenases, and the decrease in mucous viscosity. The mechanism of action for the treatment of acetaminophen toxicity is through the provision of additional glutathione substrate.
Acetylcysteine is used to treat acetaminophen toxicity in both dogs and cats. Dogs, and particularly cats, are extremely sensitive to acetaminophen and will develop sever methemoglobinemia and liver damage within hours of ingestion. There is still some debate regarding the exact enzymatic pathway of acetaminophen metabolism in the dog and cat, but it is well established that the hepato-protective qualities of acetylcysteine are due to the provision of additional glutathione precursor. It is critically important to begin therapy as soon as possible, and in cases where a large quantity may have been ingested, some clinicians recommend starting with a loading dose of acetylcysteine.
Acetylcysteine has a number of clinical uses in the horse. Nebulized acetylcysteine is used for the treatment of meconium and milk aspiration in the neonatal foal. Acetylcysteine retention enemas may be used to treat refractory meconium impactions. It is also used as a mucolytic agent in intra-uterine infusions, and in the treatment of chondroids of the guttural pouch.
Topical Ophthalmic Use
Topical acetylcysteine is used commonly on its own, or in combination with antibiotics or antifungal drugs of the treatment of KCS and corneal ulcers.
Dogs, Cats and Horses
May Be Prescribed by Vets for:
Acetaminophen toxicity, meconium impaction, mucolytic, corneal ulceration
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Barbara Forney, VMD
Dr. Barbara Forney is a veterinary practitioner in Chester County, Pennsylvania. She has a master's degree in animal science from the University of Delaware and graduated from the University of Pennsylvania School of Veterinary Medicine in 1982.
She began to develop her interest in client education and medical writing in 1997. Recent publications include portions of The Pill Book Guide to Medication for Your Dog and Cat, and most recently Understanding Equine Medications published by the Bloodhorse.
Dr. Forney is an FEI veterinarian and an active member of the AAEP, AVMA, and AMWA.
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