Mykundex (Nystatin)

Mykundex is a polyene antifungal used to treat fungal infections of the oral cavity and gastrointestinal tract.

• Oral candidiasis (thrush): reduces fungal load and resolves symptoms of mouth infection.
• Gastrointestinal candidiasis: eradicates Candida overgrowth in the digestive system.
• Esophageal candidiasis: alleviates fungal infection of the esophagus when administered as an oral suspension.

• Nystatin binds selectively to ergosterol, a key sterol component of fungal cell membranes. This binding creates pores that increase membrane permeability, leading to leakage of intracellular electrolytes and macromolecules, ultimately causing fungal cell death while sparing human cells that lack ergosterol.

Nystatin may cause adverse reactions, most of which are mild and reversible.

Common Side Effects

• Nausea: mild stomach upset after oral administration.
• Vomiting: occasional expulsion of stomach contents.
• Diarrhea: loose stools during treatment.
• Abdominal cramps: transient discomfort in the abdomen.
• Altered taste: temporary metallic or bitter sensation.
• Mild skin rash: localized erythema at the site of contact.

Serious or Rare Side Effects

• Anaphylaxis: severe allergic reaction with breathing difficulty.
• Stevens‑Johnson syndrome: rare severe skin eruption.
• Hepatotoxicity: uncommon liver enzyme elevation.
• Severe hypersensitivity: swelling of face, lips, or tongue.

Before using Mykundex, consider the following safety measures.

• Renal impairment: monitor kidney function as unchanged drug is excreted renally.
• Pregnancy: use only if the potential benefit justifies the potential risk to the fetus.
• Breastfeeding: evaluate risk versus benefit because excretion in milk is unknown.
• Concomitant antibiotics: monitor for altered gut flora that may affect efficacy.
• Known hypersensitivity: avoid if the patient has a documented allergy to polyene antifungals.
• Store below 25°C: keep in the original container, protect from moisture and light.

Nystatin can interact with other medicines; some require avoidance while others need monitoring.

Major Interactions (Avoid)

• Amphotericin B: concurrent use may increase nephrotoxicity risk.
• Systemic azoles (e.g., fluconazole): may reduce nystatin's local efficacy.
• Live vaccines: theoretical risk of reduced vaccine effectiveness.

Moderate Interactions (Monitor Closely)

• Antacids: altered gastric pH may affect drug dissolution.
• Broad‑spectrum antibiotics: may predispose to fungal overgrowth, requiring clinical observation.