Folinic Acid Calcium Salt Pentahydrate (Leucovorin Calcium Pentahydrate), a reduced folic acid, is used in combination with other chemotherapeutics.

Methotrexate (WR19039) is a folate analog, an inhibitor of the dihydrofolate reductase DHFR. Methotrexate has antimetabolic, antitumor, and immunosuppressive activities, and is commonly used in rheumatoid arthritis and various tumors.

Diaveridine (AI3-23935) (DVD) is a popular antibacterial synergist that is widely used in combination with sulfonamide. It has been reported to be genotoxic to mammalian cells, but more studies are required to clarify this.

Levoleucovorin Calcium (CL307782), a calcium salt of the folinic acid, is used in cancer chemotherapy as an adjuvant.

Trimethoprim lactate (NSC-106568 lactate) is an antibiotic that inhibits bacterial dihydrofolate reductase (DHFR). Trimethoprim lactate has demonstrated antimicrobial activity, with excellent inhibition of Gramnegative bacteria. Trimethoprim lactate is used alone for the Trimethoprim lactate is used alone or in combination with other antibiotics to treat a variety of eye, lung, and gastrointestinal infections.

Folinic acid calcium (Leucovorin Calcium) is the active metabolite of folic acid. Leucovorin is used principally as an antidote to folic acid antagonists.

Levomefolate calcium, an artificial form of folate, is a coenzymated form of folic acid that offers a more bioavailable alternative in dietary supplements.

Pemetrexed disodium (LY-231514) is a parenterally administered folate antagonist and antineoplastic agent, used in the treatment of non-small cell lung cancer and malignant mesothelioma. Pemetrexed disodium therapy has been associated with moderate rates of serum enzyme elevations during therapy, but has not been convincingly linked to instances of acute, clinically apparent liver injury.