Diltiazem at concentrations of 3 and 30 μg L−1 affected the haematological and blood biochemical profile of rainbow trout.
Creatine kinase activity was markedly increased at all tested diltiazem concentrations at the end of the exposure.
Diltiazem exposed fish (30 μg L−1) showed scattered to mild histopathological changes in liver, kidney and heart.
Antioxidant enzyme activity in liver and gills of trout at an environmentally relevant concentration was slightly affected.