The CosmoFer injection should not be administered concomitantly with oral iron preparations as the absorption of oral iron will be reduced. Oral iron therapy should not be started earlier than 5 days after the last injection of CosmoFer.
Large doses of iron dextran (5 ml or more) have been reported to give a brown colour to serum from a blood sample drawn four hours after administration.
The drug may cause falsely elevated values of serum bilirubin and falsely decreased values of serum calcium.