Ferrous sulphate is an iron supplement, according to the UK's National Health System website. Doctors may prescribe this medicine when a patient is anemic, meaning she does not have enough iron in her blood.
Iron plays an important role in the circulatory system, as it is an essential part of hemoglobin. Hemoglobin is what holds oxygen in the blood. Therefore, a deficiency of iron may cause problems throughout the body.
Though patients may purchase ferrous sulphate over the counter, they should consult a doctor before taking the medication. Supplements like ferrous sulphate vary widely in their doses, and a doctor may advise patients on the correct dose.