FKK is an indazole derivative and also a novel bronchodilator.

FKK causes direct vasodilation in the coronary, mesenteric and femoral vasculatures, but has no effect on the renal vasculature. It is particularly pertinent that FKK (30 mg/kg, i.d., enough to cause marked bronchodilation), unlike aminophylline (30 mg/kg, i.d.), does not significantly influence the cardiovascular system.FKK is an indazole derivative and also a novel bronchodilator. FKK (0.1 to 3.0 mg/kg, i.v.) slightly increases respiratory frequency, left ventricular (LV) dp/dt max and myocardial contractile force. A slight increase followed by a decrease is observed in systemic blood pressure and LV systolic pressure.