Abstract
As information on the comparative bioavailability of digoxin tablets in dogs is scarce, three brands of digoxin tablets, commercially available in Belgium, were compared in 6 healthy dogs in a cross‐over randomized design. Each dog received 1 mg digoxin on four occasions (once intravenously and 3 times orally). The mean areas under the curve relative to the intravenous value were 80, 71 and 65%. For the 3 oral preparations peak plasma concentrations were reached within 1 hour after dosing and often within 30 minutes. The mean peak concentrations were 11.0, 10.0 and 8.1 ng/ml. The times for 50% dissolution were 4.5, 7.5 and 25 minutes. Although differences between brands were only significant for the dissolution rate, the same ranking order was present for all parameters. It is therefore concluded that it may be advisable not to switch a digitalized dog from one brand to another.
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