Do not use iron to treat hemolytic anemias unless an iron deficient state also exists. Do not administer therapeutic iron doses longer than six months except under the supervision of a physician. Do not administer parenteral iron together with oral iron to avoid iron overload. Do not administer iron to patients receiving repeated blood transfusions, since there is considerable amount of iron in the hemoglobin of transfused erythrocytes. Folic acid should be administered with caution to patients with undiagnosed anemia since it may obscure the diagnosis of pernicious anemia resulting to progression of neurologic complications.