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Dogs and cats
May Be Prescribed by Vets for:
Congestive heart-failure, cardiac arrhythmias, atrial fibrillation and supraventricular tachycardia.
Digoxin is commercially
available as oral tablet and capsule 10mg,
12.5mg-(chewable) 25mg,30mg,50mg, oral liquid
12.5mg/5ml, injection solution 50mg/ml, 2% topical
Search for Available Dosage Forms
Digoxin and the other digitalis glycosides have direct effects on cardiac muscle and affect the electrical conduction in the heart. Digoxin increases cardiac output by increasing myocardial contractility. It also decreases sympathetic tone and as a result causes increased diuresis and a reduction of edema. The overall result is a reduction in heart size, heart rate, blood volume, and pulmonary and venous pressures.
The electrocardiac effects of digitalis include slowing the conduction velocity at the AV node and a prolonged effective refractory period. Other electrocardiographic effects are an increased PR interval, decreased QT interval, and depression of the ST segment.
Digoxin traditionally has been used to treat congestive heart failure in both dogs and cats. It usually is used in conjunction with other medications including diuretics and angiotensin-converting enzyme (ACE) inhibitors.
Although digoxin has improved and probably prolonged the quality of life for many veterinary cardiac patients, it remains a drug that requires careful monitoring. It has a narrow margin of safety and there is significant variation in absorption between patients. Cats in particular have a high incidence of toxicity, although toxicity also occurs in approximately 25% of dogs. The absorption of digoxin may be affected by food and by the formulation of the medication. It usually is given on an empty stomach and the dose may need readjustment with any change in formulation or manufacturer. Cats frequently dislike the taste of digoxin elixir and some investigation of flavoring alternatives is helpful. Digoxin dosing should be based on lean bodyweight with adjustment for ascites and fat. Digoxin is excreted by the kidneys and the dose may need to be adjusted downward for animals with renal disease. Serum digoxin levels should be followed carefully in both dogs and cats particularly when starting on treatment. With the advent of newer cardiac medications, some veterinary cardiologists are less likely to use digoxin as a first-line drug.
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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