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Folinic acid, also known as 5-formyl tetrahydrofolic acid or leucovorin, treats various cancers when employed with 5-fluorouracil (5-FU). Additionally, leucovorin serves as an antidote to folic acid antagonists like methotrexate. Folinic acid's properties allow it to function as an antidote, chemotherapy-modulating agent, and rescue agent for the chemotherapy category of medications. This activity will discuss the approved indications, intricate mechanism of action, and contraindications for folinic acid while addressing its role in treating specific cancer types and megaloblastic anemia. The activity will also discuss the adverse event profile, off-label applications, and monitoring protocols associated with folinic acid, offering insights for the interprofessional team involved in the care of patients undergoing treatment with 5-FU, methotrexate, and other conditions where folinic acid proves indispensable. Objectives: Identify appropriate clinical indications for folinic acid supplementation, distinguishing between various conditions and patient populations where it may be beneficial. Implement folinic acid therapy per evidence-based guidelines, considering proper dosing, route of administration, and monitoring requirements for specific clinical scenarios. Apply knowledge of potential adverse effects, contraindications, and drug interactions associated with folinic acid to minimize risks and ensure patient safety. Develop effective communication with patients and their caregivers regarding the benefits, risks, and expectations of folinic acid therapy, fostering informed decision-making and treatment adherence. Access free multiple choice questions on this topic.

Therapeutic dosing of folinic acid varies by indication, and there is no internationally accepted single gold-standard regimen.[3] Overdose is rare, and limited data is available about its effects. As mentioned above, folinic acid is commonly used with other chemotherapy agents, and it is challenging to discern causal relationships. Overdose effects generally appear as extensions of the previously mentioned adverse effects. The toxic dose of folinic acid is unknown, and there is no reported antidote. However, there are reports that excessive folinic acid can nullify the therapeutic effects of specific chemotherapy agents.[25] Therapeutic doses vary depending on the indication, and because multiple folinic acid-containing regimens can exist for a single indication, clinicians should seek and closely follow appropriate literature for individual cases.[6]

Managing drug overdose and toxicities relative to chemotherapy regimens requires an interprofessional team of healthcare professionals, including physicians and specialists, advanced practice practitioners, nurses, laboratory technologists, and pharmacists. Without proper management, the morbidity and mortality from these regimens (ie, methotrexate, 5-FU) could significantly increase. Careful monitoring of gastrointestinal complications and abnormal lab values by clinicians should prompt a coordinated care effort that includes the following: Ordering hematologic studies (CBC with differential) and parameters indicating renal function (BUN, creatinine). Monitor the patient for signs and symptoms of neurological decline, gastrointestinal complications such as diarrhea or stomatitis, and anemia. Consult with the pharmacist about using chemotherapeutic agents with a precise record of timing and dosage. Consult the intensivist about ICU care and monitor if the patient becomes hemodynamically unstable. Managing malignancies and immunologic disorders is not a process that stops with the oncologist. Careful monitoring from the primary care team and nursing is imperative. A thorough drug administration record is crucial to identify and manage cases of overdose or toxic effects quickly. Nursing staff will often be on the front line to observe harmful effects and promptly report these to the rest of the clinical team. In addition to dosing and administration, the pharmacists must conduct thorough medication reconciliation and report any concerns to the healthcare team. Only by working as an interprofessional team can these outcomes be avoided. Several studies over 20 years have outlined the importance of folinic acid in chemotherapy. With many more ongoing studies, maintaining an up-to-date approach to patient care is necessary. Folinic acid therapy requires stringent dosing and administration timing to be effective.