Azithromycin powder for oral suspension, once reconstituted, is labeled to be used within 10 days. By contrast:
• Methylphenidate (e.g., Quillivant XR) has a much longer beyond-use period (months) after pharmacy reconstitution per labeling.
• Famotidine oral suspension (commercial) commonly has a longer in-use timeframe (e.g., around 30 days) after reconstitution.
• Vancomycin oral solutions (e.g., commercially available products like Firvanq or extemporaneously prepared) are typically stable longer than 10 days (often around 14 days refrigerated, per labeling/product guidance).
Therefore, among the options, Azithromycin is the oral suspension with a maximum 10-day stability after reconstitution.
References (Pharmacy Technician documents / Study Guides):
• Manufacturer-labeled stability periods for common oral suspensions used in community pharmacy (e.g., azithromycin 10-day in-use period).
• PTCB/ExCPT study materials: common antibiotic suspension beyond-use periods (amoxicillin/augmentin/azithromycin comparisons).
