Monocrotophos is an organophosphate insecticide. It is acutely toxic to birds and humans. Monocrotophos administered animals exhibited mild hyperglycemia and dyslipidemia in blood. Cardiac oxidative stress was conferred by accumulation of protein carbonyls, lipid peroxidation and glutathione production. The cardiac markers (cTn-I, CK-MB and LDH) were showed elevated expression in blood plasma, which signals the cardiac tissue damage. The histopathology of the heart tissue authenticated the monocrotophos induced tissue damage by showing signs of nonspecific inflammatory changes and edema between muscle fibres. Thus the findings of this preliminary study illustrate the cardiotoxic effect of prolonged monocrotophos intake in rats and suggest that MCP can be a possible independent and potent environmental cardiovascular risk factor.