Abstract
A single intravenous administration of theophylline as aminophylline at 10 mg/kg to four mares induced a diuresis in which maximal urine production was more than seven times the control volume. The diuretic effect was maximal within the first hour post-administration, and lasted approximately 6 h. Theophylline resulted in dose-related tachycardia, polypnoea and nervous symptoms (tactile, visual and auditory hypersensitivity, muscle tremor, sweating) in normal mares, but had only minor effects on arterial and central venous blood pressures, intrapleural pressure, red blood cell variables and plasma proteins. The upper limit of safe plasma theophylline concentration in horses is approximately 15 micrograms/ml. Whenever feasible, the oral or intragastric route of administration should be used as it is safer than the intravenous route.
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