Ferrous sulphate 200mg tablets are for preventing folic acid and iron deficiency during pregnancy ferrous sulphate tablets work by restoring iron to your body when the body does not get enough iron it cannot produce the number of normal red blood cells needed to keep you in good health these tablets contain two active ingredients ferrous sulphate and folic acid ferrous sulphate is a form of iron and folic acid is one of the members of the b vitamin group both are essential to a healthy p