title: Pharmacologic interaction of furosemide and phenylbutazone in horses.
abstract: The effect of premedication with phenylbutazone on systemic hemodynamic and diuretic effects of furosemide was examined in 6 healthy, conscious, mares. Mares were instrumented for measurement of systemic hemodynamics, including cardiac output and pulmonary arterial, systemic arterial, and intracardiac pressures, and urine flow. Each of 3 treatments was administered in a randomized, blinded study; furosemide (1 mg/kg of body weight, IV) only, phenylbutazone (8.8 mg/kg, PO, at 24 hours and 4.4 mg/kg, IV, 30 minutes before furosemide) and furosemide, or 0.9% NaCl. Phenylbutazone administration significantly attenuated, but did not abolish, the diuretic effect of furosemide. Phenylbutazone completely inhibited the immediate effect of furosemide on cardiac output, stroke volume, total peripheral resistance, and right ventricular peak pressure. Premedication with phenylbutazone did not inhibit equally the diuretic and hemodynamic effects of furosemide, indicating that some of furosemide's hemodynamic effects are mediated by an extrarenal activity of furosemide.
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D001794:Blood Pressure / Q000187:drug effects; D001798:Blood Proteins / Q000187:drug effects / Q000378:metabolism; D002302:Cardiac Output / Q000187:drug effects; D003971:Diastole / Q000187:drug effects; D004231:Diuresis / Q000187:drug effects*; D004232:Diuretics / Q000494:pharmacology*; D004311:Double-Blind Method; D004347:Drug Interactions; D005665:Furosemide / Q000494:pharmacology*; D006439:Hemodynamics / Q000187:drug effects*; D006736:Horses / Q000502:physiology*; D010653:Phenylbutazone / Q000494:pharmacology*; D013599:Systole / Q000187:drug effects; D013997:Time Factors; D014655:Vascular Resistance / Q000187:drug effects
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D001798:Blood Proteins; D004232:Diuretics; D005665:Furosemide; D010653:Phenylbutazone