Suspension stable maximum 10 days after reconstitution:

Methylphenidate, typically used to treat ADHD, is not recommended for use after reconstitution beyond a few days due to its instability. The reconstituted forms of this medication have shorter shelf lives and require careful storage to maintain effectiveness, often necessitating immediate usage after preparation.

Famotidine, used mainly for gastrointestinal issues, also does not have a stable suspension beyond a few days. Once reconstituted, famotidine should ideally be used within 24 hours to ensure its efficacy, as prolonged exposure to the solution can lead to degradation of the active ingredient.

Vancomycin, an antibiotic used for serious bacterial infections, typically retains stability for only 24 to 48 hours after reconstitution, depending on storage conditions. Its rapid degradation outside of this time frame limits its use and requires careful handling and planning for administration to patients.