Drugs Used in Anemia
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1 Drugs Used in Anemia
2 Drugs of Anemia Anemia is defined as a below-normal plasma hemoglobin concentration resulting from: a decreased number of circulating red blood cells or an abnormally low total hemoglobin content per unit of blood volume.
3 March 17 Munir Gharaibeh MD, PhD, MHPE 3
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5 General signs and symptoms of anemia include fatigue, rapid heartbeat, shortness of breath, pale skin, dizziness, and insomnia. Anemia can be caused by Chronic blood loss, bone marrow abnormalities, increased hemolysis, infections, malignancy, endocrine deficiencies, renal failure. A large number of drugs cause toxic effects on blood cells, hemoglobin production, or erythropoietic organs, which, in turn, may cause anemia. Nutritional anemias are caused by dietary deficiencies of substances such as iron, folic acid, and vitamin B12 (cyanocobalamin) that are necessary for normal erythropoiesis. Anemia can be at least temporarily corrected by transfusion of whole blood.
6 A. Iron: Agents Used to Treat Anemia Iron is stored in the intestinal mucosal cells, liver, spleen, and bone marrow as ferritin (an iron protein complex) until needed by the body. Iron is delivered to the marrow for hemoglobin production by a transport protein, namely transferrin. Iron deficiency results from acute or chronic blood loss, from insufficient intake during periods of accelerated growth in children, and in heavily menstruating or pregnant women. Iron deficiency results from a negative iron balance due to depletion of iron stores and/or inadequate intake, culminating in hypochromic microcytic anemia (due to low iron and small-sized red blood cells). In addition to general signs and symptoms of anemia, iron deficiency anemia may cause Pica (hunger for ice, dirt, paper, etc.). Koilonychias (upward curvature of the finger and toe nails) Soreness and cracking at the corners of the mouth.
7 Mechanism of action: Supplementation with elemental iron corrects the iron deficiency. 150 to 180 mg/day of oral elemental iron administered in divided doses two to three times daily for patients with iron deficiency anemia. Pharmacokinetics: Iron is absorbed after oral administration. Acidic conditions in the stomach keep iron in the reduced ferrous form, which is the more soluble form. Iron is then absorbed in the duodenum. Note: The amount absorbed depends on the current body stores of iron. If iron stores are adequate, less will be absorbed. If stores are low, more iron will be absorbed. The relative percentage of iron absorbed decreases with increasing doses. For this reason, it is recommended that most people take the prescribed daily iron supplement in two or three divided doses. Some extended-release formulations may be dosed once daily.
8 Iron Oral Preparations
9 Iron dextran. Parenteral Formulations of Iron Sodium ferric gluconate complex. Iron sucrose. Macrophages phagocytize iron dextran and release iron from the dextran molecule. When iron sucrose is used, specific exchange mechanisms transfer iron to transferrin. While parenteral administration treats iron deficiency rapidly, oral administration may take several weeks.
10 Iron Adverse effects Oral iron supplements: Gastrointestinal (GI) disturbances caused by local irritation (abdominal pain, constipation, diarrhea, etc.). dark stools. Parenteral iron formulations may be used in those who cannot tolerate oral iron. Fatal hypersensitivity and anaphylactoid reactions can occur in patients receiving parenteral iron (mainly iron dextran formulations). A test dose should be administered prior to iron dextran. Excessive iron can cause toxicities that can be reversed using chelators such as deferoxamine.
11 B. Folic acid (folate): The primary use of folic acid is in treating deficiency states that arise from inadequate levels of the vitamin. Folate deficiency may be caused by: 1) Increased demand (pregnancy and lactation). 2) Poor absorption caused by pathology of the small intestine. 3) Alcoholism. 4) Treatment with drugs that are dihydrofolate reductase inhibitors (for example, methotrexate, pyrimethamine, and trimethoprim). In the latter case, the reduced or active form of the vitamin (folinic acid also known as leucovorin calcium available as oral and parenteral formulations) is used for treatment. A primary result of folic acid deficiency is Megaloblastic Anemia (largesized red blood cells),which is caused by diminished synthesis of purines and pyrimidines. This leads to an inability of erythropoietic tissue to make DNA and, thereby, proliferate.
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14 Pharmacokinetics and Adverse effects Folic acid is well absorbed in the jejunum unless pathology is present. If excessive amounts of the vitamin are ingested, they are excreted in the urine and feces. Oral folic acid administration is nontoxic. No substantiated side effects reported. Rare hypersensitivity reactions to parenteral injections have been reported.
15 C. Cyanocobalamin and hydroxocobalamin (vitamin B12) Deficiencies of vitamin B12 can result from: Low dietary levels. More commonly, poor absorption of the vitamin due to: The failure of gastric parietal cells to produce intrinsic factor (as in pernicious anemia). Loss of activity of the receptor needed for intestinal uptake of the vitamin. Intrinsic factor is a glycoprotein produced by the parietal cells of the stomach, and it is required for vitamin B12 absorption. In patients with bariatric surgery (surgical treatment for obesity), vitamin B12 supplementation as cyanocobalamin is required in large oral doses, sublingually or once a month by the parenteral route. Intramuscular hydroxocobalamin is now preferred since it has a rapid response, is highly protein bound, and maintains longer plasma levels.
16 In addition to general signs and symptoms of anemia, vitamin B12 deficiency anemia may cause tingling (pins and needles) in the hands and feet, difficulty walking, dementia and, in extreme cases, hallucinations, paranoia, or schizophrenia. The vitamin may be administered orally (for dietary deficiencies), intramuscularly, or deep subcutaneously (for pernicious anemia). Note: Folic acid administration alone reverses the hematologic abnormality and, thus, masks the vitamin B12 deficiency, which can then proceed to severe neurologic dysfunction and disease. The cause of megaloblastic anemia needs to be determined in order to be specific in terms of treatment. Therefore, megaloblastic anemia should not be treated with folic acid alone but, rather, with a combination of folate and vitamin B12. Therapy must be continued for the remainder of the life of a patient suffering from pernicious anemia. This vitamin is nontoxic even in large doses.
17 D. Erythropoietin and Darbepoetin Peritubular cells in the kidneys work as sensors that respond to hypoxia and mediate synthesis and release of erythropoietin a glycoprotein (EPO). EPO stimulates stem cells to differentiate into proerythroblasts and promotes the release of reticulocytes from the marrow and initiation of hemoglobin formation. EPO, thus, regulates red blood cell proliferation and differentiation in bone marrow. Human erythropoietin (epoetin alfa), produced by recombinant DNA technology, is effective in the treatment of anemia caused by: End-stage renal disease. Anemia associated with human immunodeficiency virus infection, Anemia in bone marrow disorders. Anemias of prematurity. Anemias in some cancer patients.
18 Darbepoetin Long-acting version of erythropoietin that differs from erythropoietin by the addition of two carbohydrate chains, which improves its biologic activity. Darbepoetin has decreased clearance and has a halflife about three times that of epoetin alfa. Due to their delayed onset of action, these agents have no value in acute treatment of anemia. Supplementation with iron may be required to ensure an adequate response. The protein is usually administered intravenously in renal dialysis patients, but the subcutaneous route is preferred for other indications.
19 These agents are generally well tolerated, but side effects may include elevation in blood pressure and arthralgia in some cases. Note: The former may be due to increases in peripheral vascular resistance and/or blood viscosity. When epoetin alfa is used to target hemoglobin concentrations more than 11 g/dl, serious cardiovascular events (such as thrombosis and severe hypertension), increased risk of death, shortened time to tumor progression, and decreased survival have been observed. The recommendations for all patients receiving epoetin alfa or darbepoetin include a minimum effective dose that does not exceed a hemoglobin level of 12 g/dl, and the hemoglobin should not rise by more than 1 g/dl over a 2-week period. Additionally, if the hemoglobin level exceeds 10 g/dl, doses of epoetin alfa or darbepoetin should be reduced or treatment should b discontinued.
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