N-N'-Dicyclopropyl-methyl-piperazine-dichlorhydrate (Ino 2628-CZ) is a novel inotropic compound. The absorption, distribution, excretion and metabolism of radiochemically labelled 14C-Ino 2628-CZ has been studied in male and female rats after intravenous and oral administration. The compound was mainly excreted during the first 24 h after both administrations, although traces of radioactivity were still measured at 7 days post-dose. About 20% of the drug is excreted in the urine unchanged. Nine metabolites were separated, four of them being characterized.