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May Be Prescribed by Vets for:
Muscle relaxation as an adjunct to anesthesia.
Guaifenesin is commercially available as oral powder
2gm and injection 50mg/ml.
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Guaifenesin is a centrally acting muscle relaxant that is used as a part of many anesthetic protocols in the horse. Its mechanism of action is not precisely known but the relaxation of skeletal muscles, mild analgesic and mild sedative properties allows for lower doses of other sedatives and anesthetic agents. Guaifenesin is used for induction before inhalation anesthesia, during inhalation anesthesia and with total intravenous anesthesia (TIVA) for short procedures. Guaifenesin has minimal effects on diaphragmatic function and produces relatively little respiratory depression at normal doses. It is used primarily in horses although it has been studied and is used in other domestic species.
Guaifenesin within a Triple Drip combination also is administered with inhalant anesthesia as a means of reducing the total amount of inhalant used in a given case. This combination of intravenous and inhalant anesthesia is referred to as "balanced anesthesia." Balanced anesthesia has the advantages of less cardiovascular depression, diminished need for additional drugs to support hemodynamics and improved recoveries.
Anticholinesterase drugs such as physostigmine are contraindicated. (Plumb 2005)
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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