Flucytosine, a fluorinated pyrimidine analogue, is a synthetic antimycotic drug.

It is structurally related to the cytostatic fluorouracil and to floxuridine. It is available in oral and in some countries also in injectable form. A common brand name is Ancobon®. The drug is dispensed in capsules of 250 mg and 500 mg strength. The injectable form is diluted in 250ml NaCl-solution to contain 2.5 grams totally (10mg per ml). The solution is physically incompatible with other drugs including Amphotericin B.

Pharmacology

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Mechanisms of action

Two major mechanisms of action have been elucidated, one is that the drug is intrafungally converted into the cytostatic flourouracil that undergoes further steps of activation and finally interacts as 5-fluorouridinetriphosphate with RNA-biosynthesis and disturbs therefore the building of certain essential proteins. The other mechanism is the conversion into 5-flourodeoxyuridinemonophosphate which inhibits fungal DNA-synthesis.

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