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Antihistamine, serotonin antagonist
Dogs, cats and horses
May Be Prescribed by Veterinarians for:
Dogs and cats: antipruritic/antihistamine, serotonin syndrome
Cats: appetite stimulant, feline asthma, inappropriate elimination
Horses: Pituitary pars intermedia dysfunction (PPID), photic head-shakers.
Cyproheptadine is commercially available as a 4mg tablet and 0.4ml oral syrup.
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Cyproheptadine is an antihistamine that also has anti-serotonin activity. It is well-absorbed orally and has a wide margin of safety. Cyproheptadine is metabolized by the liver and excreted in the urine.
Cyproheptadine is used as an appetite stimulant for sick cats, including those undergoing chemotherapy. When used for this purpose it should be noted that it may take two to three days for the drug to reach full effect. It also is used to treat feline asthma in cats whose condition is not totally controlled by corticosteroids and bronchodilators. Veterinary behaviorists also use cyproheptadine in some cases of inappropriate urine spraying behavior in cats.
Cyproheptadine is used in both dogs and cats as a part of treatment for serotonin syndrome. It has been tried in dogs to treat canine Cushing's Disease although there are other medications that appear to be more effective.
Cyproheptadine has been used to treat atopic dermatitis in both dogs and cats; the general consensus is that there are other more effective drugs.
Cyproheptadine is used in conjunction with other drugs to treat PPID and photic head-shakers. Because animals with PPID usually have clinical signs similar to Cushing's Disease in humans, this condition also may be called equine Cushing's-like Disease (ECD). Pergolide is considered the drug of choice for PPID. Cyproheptadine frequently is combined with pergolide to treat PPID.
Photic head-shakers are a troubling medical/behavioral problem of the horse. Cyproheptadine is prescribed to treat head-shakers because of its antihistamine properties. Cyproheptadine sometimes is combined with carbamazepine. Prohibited in most sanctioned competitions, cyproheptadine is an ARCI Class 4 drug.
Common side-effects include sedation, dry mucous membranes, and increased heart rate.
Cyproheptadine may have an additive effect when combined with other central nervous system (CNS) depressant drugs, such as tranquilizers.
Overdose causes similar but more severe side effects.
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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