Adult PatientsCYTOFLU® (Flucytosine or 5-fluorocytosine or 5-FC) tablets / Capsules are an antifungal prescription medication given to patients who have a high chance of developing Cryptococcosis, Candidosis, Aspergillosis, Chromoblastomycosis & Cancer Therapy.

Pediatric Patients:  CYTOFLU® tablets or oral solution is prescribed for the prevention of Cryptococcal & other fungal disease in patients that are 4 months to 16 years of age.

Important Safety Information and Most Serious Side Effects


Applies to CYTOFLU– Flucytosine: oral capsule, oral tablet

In addition to its needed effects, some unwanted effects may be caused by Flucytosine. In the event that any of these side effects do occur, they may require medical attention.

You should check with your doctor immediately if any of these side effects occur when taking CYTOFLU:

More common

            • Skin rash, redness, or itching
            • sore throat and fever
            • unusual bleeding or bruising
            • unusual tiredness or weakness
            • yellow eyes or skin

Less common

            • Confusion
            • hallucinations (seeing, hearing, or feeling things that are not there)
            • increased sensitivity of skin to sunlight

Some of the side effects that can occur with flucytosine may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

More common

            • Abdominal pain
            • diarrhea
            • loss of appetite
            • nausea or vomiting

Less common

            • Dizziness or light-headedness
            • drowsiness
            • headache

For Healthcare Professional


Applies to CYTOFLU– Flucytosine: oral tablet & capsule


Gastrointestinal side effects have included nausea, emesis, abdominal pain, diarrhea, anorexia, dry mouth, duodenal ulcer, gastrointestinal hemorrhage, enterocolitis, and ulcerative colitis.

Nausea is common at high doses, generally occurs in the first two weeks of therapy, and often resolves with time or temporary dose reduction. Diarrhoea is often associated with cramps, occurs most frequently in the first two weeks of therapy, and frequently resolves with time or temporary dose reduction. One case has been reported of a patient on long-term therapy who developed diarrhoea which did not resolve spontaneously. X-ray of the small bowel revealed ulceration and the ileocecal valve and distal ileum appeared edematous. Flucytosine was discontinued and the patient improved over the next two weeks.


Some patients experience significant increases in liver function tests and may develop signs and symptoms of hepatitis. Liver function test abnormalities generally resolve after discontinuation of flucytosine.

Hepatic side effects have included jaundice, hepatic dysfunction, bilirubin elevation, increased hepatic enzymes, and acute hepatic injury including hepatic necrosis with possible fatal outcome in debilitated patients.


Hematologic side effects have included anemia, agranulocytosis, aplastic anemia, eosinophilia, leukopenia, pancytopenia, thrombocytopenia, and fatal cases of bone marrow suppression.

Bone marrow suppression may range from isolated leukopenia or thrombocytopenia to pancytopenia. Often there is just mild leukopenia or thrombocytopenia which does not require discontinuation of the drug. In most cases the suppression is reversible following discontinuation of flucytosine therapy, but at least one case of fatal, irreversible marrow failure has occurred.


Photosensitivity has been reported in one case of a patient receiving long-term flucytosine. The photosensitivity persisted for one year after completion of therapy.

A case of anaphylaxis has been reported. In that case, a patient who had hemophilia and AIDS was receiving flucytosine for oral candidiasis. Flucytosine therapy was started following 10 days of miconazole and the patient developed a fever, erythema, pruritus, tachycardia and hypotension requiring volume support. Rechallenge was attempted one week later with one tablet. The rechallenge resulted in the same signs and symptoms and ran a similar course.

Hypersensitivity side effects have included allergic reactions. Rashes have been reported rarely. At least one case of photosensitivity has been reported, in addition to a case of anaphylaxis.


Cardiovascular side effects have included cardiac arrest, myocardial toxicity, and ventricular dysfunction. Cardiac toxicity with ST elevation has been reported in a 34-year-old woman, with no previous history of heart disease, the day after completing a 2-day flucytosine therapy.

A 34-year-old woman reported severe chest pain the day after completing a 2-day flucytosine therapy. Cardiac echography indicated septo-apico-lateral severe hypokinesia, with left ventricular ejection fraction less than 15%. Aggressive cardiac intensive care with positive inotropic agents, placement of an intra-aortic balloon pump counterpulsation, and milrinone along with continuous veno-venous hemodiafiltration were needed over the 2 weeks of hospitalization before restoration of her cardiovascular status. Patient has not shown further signs of heart problems during the 2 years since this event.


Respiratory side effects have included dyspnea, chest pain, and respiratory arrest.


Dermatologic side effects have included rash, pruritus, urticaria, photosensitivity, and Lyell’s syndrome.


Genitourinary side effects have included crystalluria.


Renal side effects have included azotemia, creatinine and BUN elevation, and renal failure.

Nervous system

Nervous system side effects have included ataxia, hearing loss, headache, paresthesia, parkinsonism, peripheral neuropathy, pyrexia, vertigo, sedation, and convulsions.


Psychiatric side effects have included confusion, hallucinations, and psychosis.


Metabolic side effects have included hypoglycemia.


Other side effects have included fatigue and weakness.

Patients should tell their doctor if they have any side effect that bothers them or that does not go away.

Patients should call their doctor for medical advice about side effects. Consumers may report side effects to the Manufacturer or to Jolly Healthcare.

Please see full Prescribing Information, including Boxed WARNINGS and INSERT, for additional Important Safety Information.


Pay for Genuine & Authentic – Generic Ancobon i.e., Cytoflu.

Please avoid counterfeit, Illegal & Unbilled Ancobon, Ancotil & Flucytosine