Nystatin Orifarm (Nystatin)

Nystatin Orifarm is a polyene antifungal used to manage Candida infections of the oral and gastrointestinal pathways.

• Oral candidiasis (thrush): reduces fungal load and resolves oral lesions.
• Esophageal candidiasis: treats infection and alleviates dysphagia caused by Candida overgrowth.
• Gastrointestinal candidiasis: eradicates Candida colonisation throughout the GI tract, improving symptoms such as abdominal discomfort.

• Nystatin binds selectively to ergosterol, a key sterol in fungal cell membranes. This binding creates pores that increase membrane permeability, leading to leakage of intracellular components and ultimately fungal cell death. Because human cell membranes contain cholesterol rather than ergosterol, the drug exhibits selective toxicity toward Candida species.

Nystatin Orifarm is generally well tolerated, but adverse reactions can occur.

Common Side Effects

• Nausea: mild to moderate stomach upset after oral administration.
• Vomiting: occasional emesis, especially with higher doses.
• Abdominal discomfort: cramping or pain in the stomach region.
• Diarrhea: loose stools during treatment.
• Altered taste: temporary metallic or bitter sensation.
• Mild skin rash: localized erythema at the mouth or throat.

Serious or Rare Side Effects

• Anaphylactic reaction: sudden swelling, difficulty breathing, or hives.
• Severe skin reactions: Stevens‑Johnson syndrome or toxic epidermal necrolysis.
• Hepatic dysfunction: elevated liver enzymes indicating liver stress.
• Neutropenia: marked reduction in white blood cells.
• Persistent fever: unexplained fever that does not resolve.

Before prescribing Nystatin Orifarm, clinicians should consider several safety measures.

• Assess hypersensitivity: avoid use in patients with known allergy to polyene antifungals.
• Monitor immunocompromised patients: watch for breakthrough infections.
• Evaluate renal function: adjust therapy if severe renal impairment is present.
• Use caution in hepatic disease: consider liver function monitoring.
• Store at ambient temperature: keep below 25 °C, retain in original packaging, and protect from moisture.

Nystatin has limited systemic absorption, but certain drug combinations may require attention.

Major Interactions (Avoid)

• Concomitant polyene use: avoid simultaneous administration of other polyene antifungals (e.g., amphotericin B) due to additive toxicity risk.
• Known hypersensitivity to related agents: avoid with drugs containing similar fungal‑targeting structures.

Moderate Interactions (Monitor Closely)

• Broad‑spectrum antibiotics: may alter gut flora and affect nystatin efficacy; monitor clinical response.
• Antacids or sucralfate: could delay dissolution of oral formulation; advise spacing of doses.
• Nephrotoxic agents: monitor renal parameters when used with aminoglycosides or loop diuretics.