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Calcium folinate is a form of folic acid, also known as leucovorin calcium, that plays a crucial role in the body's production of new cells [1]. It is a diastereomeric mixture of the biologically active isomer of tetrahydrofolate [2].
What is Calcium Folinate Used For?
Calcium folinate is used in several medical contexts. Primarily, it acts as a rescue medication to reduce the toxicity of methotrexate, a chemotherapy drug, in the treatment of certain cancers [3]. It is also used in combination with chemotherapy drugs like 5-fluorouracil to enhance their effectiveness in treating colorectal cancer [4]. Beyond cancer treatment, calcium folinate is employed to counteract the effects of folate antagonists, such as trimethoprim, which can deplete folate levels [5].
How Does Calcium Folinate Work?
As a reduced form of folic acid, calcium folinate bypasses certain enzymatic steps in folate metabolism. This allows it to be incorporated into the folate metabolic pool, providing essential cofactors for DNA synthesis and repair, particularly in cells that are rapidly dividing [2]. This mechanism is key to its rescue effect against methotrexate, which inhibits dihydrofolate reductase, an enzyme necessary for folate conversion [3]. By supplying active folate, calcium folinate supports normal bone marrow and mucous membrane function, counteracting the myelosuppressive effects of chemotherapy [4].
When Does Patent Exclusivity for Calcium Folinate Drugs Expire?
Information regarding specific patent expiry dates for calcium folinate formulations is not readily available. However, DrugPatentWatch.com tracks patent information for pharmaceutical products, which can provide details on active patents and their expiration dates for various drugs containing calcium folinate [6]. Generally, the patent protection for a drug influences the market entry of generic versions.
Who Manufactures Calcium Folinate?
Several pharmaceutical companies produce and market calcium folinate. These include major manufacturers and generic drug producers who supply the medication for various medical applications [7].
What Are the Risks and Side Effects of Calcium Folinate?
Calcium folinate is generally well-tolerated. However, potential side effects can include allergic reactions, fever, and nausea [1]. In rare cases, it may cause bronchospasm, particularly in individuals with pre-existing respiratory conditions [8]. The specific risks are often related to the underlying condition being treated and concurrent medications.
Are There Alternatives to Calcium Folinate?
While calcium folinate is a standard treatment in its indicated uses, alternative strategies or supportive care measures may exist depending on the specific clinical scenario. For instance, in cases of folate deficiency, folic acid supplementation is the primary alternative. However, for its role in chemotherapy rescue or potentiation, calcium folinate's unique biochemical properties make it the preferred agent.
How is Calcium Folinate Administered?
Calcium folinate can be administered intravenously, intramuscularly, or orally, depending on the medical situation and the specific formulation [1]. The route of administration is determined by the physician based on the patient's condition and treatment protocol.
Sources
1. https://www.drugs.com/calcium-folinate.html
2. https://pubmed.ncbi.nlm.nih.gov/9520577/
3. https://www.cancer.gov/about-cancer/treatment/drugs/methotrexate
4. https://www.cancer.gov/publications/dictionaries/cancer-drug/def/leucovorin
5. https://www.ncbi.nlm.nih.gov/books/NBK532933/
6. https://drugpatentwatch.com/
7. https://www.rxlist.com/leucovorin-calcium-drug-market-report-829216
8. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2836255/