Ferrous Sulfate (Defrol OS 50 mL) is a medication commonly used to treat or prevent iron deficiency anemia. It is a type of iron supplement that provides the body with the essential mineral iron, which is necessary for the production of red blood cells. Iron plays a crucial role in transporting oxygen throughout the body. Ferrous sulfate is usually prescribed to individuals who are unable to get enough iron through their diet or who have conditions that lead to iron deficiency. This medication is typically taken orally, and it may come in liquid, tablet, or capsule form. Side effects can include gastrointestinal discomfort, constipation, or dark-colored stools. It is important to follow the prescribed dosage to avoid complications or overdose.