Ferrous sulfate (or sulphate) is a medicine used to treat and prevent iron deficiency anaemia. Iron helps the body to make healthy red blood cells, which carry oxygen around the body. How much iron is in 200mg of ferrous sulphate? Each 200mg ferrous sulfate tablet is equivalent to 65mg of ferrous iron. Adults: Treatment: 130-195mg ferrous iron (2-3 tablets) daily in divided doses.