Oral Nystatin Duration: 7-14 Days
For oral candidiasis (thrush), nystatin suspension or pastilles should be administered for 7-14 days 1.
Specific Dosing by Age
Infants
- Dose: 2 mL (200,000 units) four times daily
- Administration: Use dropper to place half the dose in each side of mouth; avoid feeding for 5-10 minutes
- Duration: 7-14 days
- Note: Premature and low birth weight infants may use 1 mL four times daily 2
Children and Adults
- Dose: 4-6 mL (400,000-600,000 units) four times daily
- Alternative: 1-2 nystatin pastilles (200,000 units each) four times daily
- Duration: 7-14 days
- Administration: Retain in mouth as long as possible before swallowing 2
Key Clinical Considerations
Continue treatment for at least 48 hours after symptoms resolve and cultures confirm eradication of Candida albicans 2. This is critical—stopping too early leads to recurrence.
Important Caveats
Nystatin is second-line: The 2016 IDSA guidelines position nystatin as an alternative for mild oropharyngeal candidiasis, not first-line 1. Clotrimazole troches or miconazole buccal tablets are preferred first-line options with stronger evidence.
Fluconazole superiority: For moderate-to-severe disease, oral fluconazole (100-200 mg daily for 7-14 days) is superior and should be used instead 1.
Compliance issues: Nystatin requires 4-times-daily dosing and has poor taste, leading to significant patient inconvenience and lower compliance compared to fluconazole 3.
When to Extend Duration
While the standard is 7-14 days, consider extending to 4 weeks for:
- Denture-related candidiasis (with concurrent denture disinfection) 1
- Immunocompromised patients with persistent symptoms
- Cases with documented treatment failure at 2 weeks 4
Clinical Pitfall
Do not use nystatin for systemic mycoses—it is only effective for superficial mucosal candidiasis 2. If symptoms persist beyond 14 days or worsen, reassess for fluconazole-resistant species or consider switching to systemic azole therapy.