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Folic acid (vitamin B9) is a water-soluble vitamin used to manage and treat megaloblastic anemia. Folic acid has FDA approval for treating megaloblastic and macrocytic anemias due to folic deficiency. This activity describes the indications, mechanism of action, and contraindications for folic acid as a valuable agent in managing megaloblastic anemia and preventing other disorders. One of the beneficial roles of folate appears to be its ability to reduce homocysteine levels in neural tube defects. In addition, this activity will highlight the adverse event profile and other key factors (eg, off-label uses, dosing, monitoring, relevant interactions) pertinent to healthcare teams dealing with conditions that can benefit from supplemental folic acid. Objectives: Identify appropriate indications for folic acid supplementation based on patient characteristics and medical conditions. Screen patients at risk of folate deficiency, such as those with chronic alcoholism, malnutrition, or specific medical conditions. Assess patients' folate status through appropriate laboratory tests and interpret the results to guide folic acid therapy. Communicate effectively with patients, providing education about the benefits, potential side effects, and importance of adherence to folic acid therapy. Access free multiple choice questions on this topic.

Like other water-soluble vitamins, folic acid does not have significant storage in the body; hence toxicity is not a common concern. However, infrequent neurologic side effects have been noted in the context of folate supplementation in individuals with pernicious anemia.[27] The direct toxicity of folate only contributes minimally. Instead, the neurologic effects are more directly caused by the masking of SCD, resulting from a vitamin B12 deficiency that continues to destroy neuronal cells despite folate supplementation appearing to resolve the anemic aspect seen in pernicious anemia. There is one published case report of fatal poisoning, but the authors acknowledge that the findings may be a unique manifestation of folic acid toxicity in humans.[21]

The relative safety of folic acid allows healthcare providers to administer it to patients with little concern for adverse effects. However, specific best practice techniques should be considered to ensure positive outcomes. To increase folate levels, the primary care provider should counsel patients to consume a healthy diet, including vegetables, eggs, and milk. Dieticians can consult on the case to ensure inpatients receive appropriate food selections to enhance folate delivery. Pregnant women should be made aware of folate deficiency risks and take supplements. Healthcare providers should refer to the American College of Obstetricians and Gynecologists for prepregnancy counseling for women of childbearing age and recommend folic acid supplements based on the patient's health condition. In contrast, pregnant women should be prescribed antiepileptic drugs for only epilepsy in the smallest dose possible to prevent low folic acid level complications. Nurses and pharmacists can alert clinicians that anti-epilepsy medications are on the pregnant patient's list of medicines. The source of macrocytic megaloblastic anemia must be determined before supplement administration begins, as folate and vitamin B12 deficiency can present similarly in patients. Therefore, clinicians should consider verifying the vitamin B12 level of the patients to optimize treatment plans and improve patient outcomes when prescribing folic acid. As depicted above, all physicians, advanced practice practitioners, nursing staff, pharmacists, and dieticians should work collaboratively as an interprofessional team and communicate when dealing with patients that can benefit from folic acid supplementation.