Catalog No.S1666 Synonyms: 5-Fluorocytosine, 5-FC, NSC 103805, Ro 2-9915

For research use only.

Flucytosine (5-Fluorocytosine, 5-FC, NSC 103805, Ro 2-9915) is an antifungal drug with IC50 of 0.93 μM in C. albicans.

Flucytosine Chemical Structure

CAS No. 2022-85-7

Selleck's Flucytosine has been cited by 1 Publication

Purity & Quality Control

Choose Selective Fungal Inhibitors

Biological Activity

Description Flucytosine (5-Fluorocytosine, 5-FC, NSC 103805, Ro 2-9915) is an antifungal drug with IC50 of 0.93 μM in C. albicans.
Features First synthesized in 1957, and antifungal properties discovered in 1964.
In vitro

Flucytosine inhibits the growth of C. neoformans in Sabouraud's dextrose broth at concentrations ≥ 1.25 mg/L, and Flucytosine of 50 mg/L causes a ~50% reduction in colony-forming unit (cfu)\ in the J774.16 killing assay with viability of J774.16 cells not affected measured by trypan blue exclusion. The combination of Flucytosine and IgGl monoclonal antibody to Cryptococcus neoformans capsular glucuronoxylomannan is more effective in reducing the numbers of C. neoformans colony-forming units in vitro with J774.16 murine macrophage-like cells than either agent alone. [2] The efficacy of Flucytosine (5FC) in combination with amphotericin B (AB) and fluconazole (FCZ) is studied against 35 yeast isolates, of which the 5FC-FCZ combination is antagonistic against Candida species, but for some Candida isolates synergism is found. [3]

In vivo Administration of Flucytosine in combination with monoclonal antibody 2H1 to A/JCr mice infected with C. neoformans significantly reduces lung but not brain cfu, which is more effective than either agent alone. [2] The combination of intravenous Flucytosine in 0.9% saline (NaCl) and amphotericin B (AmB) provides synergistic antifungal activity and is associated with a lower incidence of nephrotoxicity than with AmB treatment alone. Infusion of Flucytosine (5-10 mg/kg/min) dissolved in 5% glucose into the renal artery of an in situ perfused kidney for 15 minutes increases renal blood flow (RBF) in the rat, and the renal vasodilatation persists for the duration of the Flucytosine infusion. [4]

Protocol (from reference)

Kinase Assay:[1]
  • Microdilution method:

    The culture media used are RPMI 1640 with glutamine, without bicarbonate and phenol red, buffered with morpholinopropanesulfonic acid (MOPS) (0.165 M, pH 7.0). Two-fold serial dilutions of Flucytosine (0.06-64 μg/mL) are prepared and dispensed in 50 uL aliquot, in flat-bottom 96-well assay plates which are kept frozen at -70 °C in sealed plastic bags until used. The inoculum is prepared spectrophotometrically and standardized to a concentration of 1.0-5.0 × 103 cfu per mL. A 50 μL volume of this suspension is used to inoculate each well containing 50 μL of the double concentration of Flucytosine to be tested. Once inoculated, each well therefore contains 100 μL of broth favoured over 200 μL to facilitate the agitation of the plates prior to spectrophotometric reading. After an incubation period of 24 and 48 hours at 35 °C, the plates are agitated for 3 minutes at 900 r.p.m. with a shaker and the optical density of the growth in each well is determined with the use of an automatic plate reader set at 495 nm. The inhibitory concentration of IC50 is computed mathematically.

Cell Research:[2]
  • Cell lines: J774.16 murine macrophage-like cell line
  • Concentrations: Dissolved in PBS, final concentration 50 mg/L
  • Incubation Time: 24 hours
  • Method: J774.16 murine macrophage-like cells plated on 96-well tissue culture plates are incubated with 500 u/mL murine recombinant gamma-interferon overnight at 37 °C. The medium is then replaced with fresh medium containing gamma-interferon 500 μ/mL, LPS 3 mg/L, C. neoformans cells 1.6 × 104/well and Flucytosine 50 mg/L. Plates are incubated for 24 hours at 37 °C. Cell supernatants are collected and cells lysed by adding 0.1 mL sterile distilled water to each well, incubating at room temperature for 30 minutes, and then aspirating and ejecting the lysate with a pipette several times to complete cell disruption. Wells are rinsed with PBS (0.1 mL) and the cell supernatant, and lysate and rinse from each well are pooled, vortexed, diluted 1:50, vortexed again and spread on Sabouraud's dextrose agar for the cfu determination
Animal Research:[4]
  • Animal Models: Male Sprague-Dawley rats
  • Dosages: 5 mg/kg/min
  • Administration: In situ renal perfusion at a rate of 0.13 mL/min

Solubility (25°C)

In vitro

DMSO 8 mg/mL
(61.97 mM)
Water 5 mg/mL
(38.73 mM)
Ethanol Insoluble

In vivo

Add solvents to the product individually and in order
(Data is from Selleck tests instead of citations):
0.5% methylcellulose+0.2% Tween 80
For best results, use promptly after mixing.

5 mg/mL

Chemical Information

Molecular Weight 129.09


CAS No. 2022-85-7
Storage 3 years -20°C powder
2 years -80°C in solvent
Smiles C1=NC(=O)NC(=C1F)N

In vivo Formulation Calculator (Clear solution)

Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)

mg/kg g μL

Step 2: Enter the in vivo formulation (This is only the calculator, not formulation. Please contact us first if there is no in vivo formulation at the solubility Section.)

% DMSO % % Tween 80 % ddH2O

Calculation results:

Working concentration: mg/ml;

Method for preparing DMSO master liquid: mg drug pre-dissolved in μL DMSO ( Master liquid concentration mg/mL, Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug. )

Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH2O, mix and clarify.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 1. Please make sure the liquid is clear before adding the next solvent.
2. Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such
as vortex, ultrasound or hot water bath can be used to aid dissolving.

Molarity Calculator

Mass Concentration Volume Molecular Weight

Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

Handling Instructions

Tel: +1-832-582-8158 Ext:3
If you have any other enquiries, please leave a message.

* Indicates a Required Field

Please enter your name.
Please enter your email. Please enter a valid email address.
Please write something to us.
Tags: buy Flucytosine | Flucytosine ic50 | Flucytosine price | Flucytosine cost | Flucytosine solubility dmso | Flucytosine purchase | Flucytosine manufacturer | Flucytosine research buy | Flucytosine order | Flucytosine mouse | Flucytosine chemical structure | Flucytosine mw | Flucytosine molecular weight | Flucytosine datasheet | Flucytosine supplier | Flucytosine in vitro | Flucytosine cell line | Flucytosine concentration | Flucytosine nmr