Nystatin Oral Suspension

Nystatin is an antifungal medication.

Oral nystatin is used to treat yeast infections of the mouth.

Nystatin may also be used for purposes other than those listed in this medication guide.

Take the missed dose as soon as you remember. However, if it is almost time for your next regularly scheduled dose, skip the missed dose and take the next one as directed. Do not take a double dose of this medication unless otherwise directed by your doctor.

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:

• Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
• Mouth irritation.

Nystatin is an antimycotic polyene antibiotic obtained from Streptomyces noursei. Structural formula:

Nystatin Oral Suspension, for oral administration, contains 100,000 USP Nystatin Units per mL. Inactive ingredients: alcohol (≤ 1% v/v), methylparaben, NF; dibasic sodium phosphate, USP; monobasic sodium phosphate, USP; saccharin sodium, USP; sucrose (50% w/v), NF; glycerin, USP; carboxy-methylcellulose sodium, USP; propylparaben, NF; artificial wild cherry flavor # 14783 and purified water, USP

Pharmacokinetics

Gastrointestinal absorption of nystatin is insignificant. Most orally administered nystatin is passed unchanged in the stool. In patients with renal insufficiency receiving oral therapy with conventional dosage forms, significant plasma concentrations of nystatin may occasionally occur.

Microbiology

Nystatin is both fungistatic and fungicidal in vitro against a wide variety of yeasts and yeast-like fungi. Candida albicans demonstrates no significant resistance to nystatin in vitro on repeated subculture in increasing levels of nystatin; other Candida species become quite resistant. Generally, resistance does not develop in vivo. Nystatin acts by binding to sterols in the cell membrane of susceptible Candida species with a resultant change in membrane permeability allowing leakage of intra-cellular components. Nystatin exhibits no appreciable activity against bacteria, protozoa, or viruses.

Nystatin Oral Suspension is indicated for the treatment of candidiasis in the oral cavity.

Oral doses of nystatin in excess of five million units daily have caused nausea and gastrointestinal upset. There have been no reports of serious toxic effects of superinfections (see CLINICAL PHARMACOLOGY, Pharmacokinetics).

Nystatin Oral Suspension, USP, 100,000 USP Nystatin Units per mL, is available as a cherry flavored, light creamy yellow, ready-to-use suspension. It is supplied as follows:
NDC 66689-037-01. 5 mL unit dose cup.
NDC 66689-037-50. Case contains 50 unit dose cups of 5 mL (NDC 66689-037-01), packaged in 5 trays of 10 unit dose cups each.
NDC 66689-037-99. Case contains 100 unit dose cups of 5 mL (NDC 66689-037-01), packaged in 10 trays of 10 unit dose cups each.

Interactions are not expected.