Succinylcholine Storage After Refrigeration Removal
Succinylcholine that has been removed from refrigeration can be used safely for up to 14 days at room temperature without significant loss of potency, according to FDA labeling 1.
Storage Guidelines and Stability
The FDA-approved drug label explicitly states that multi-dose vials of succinylcholine are stable for up to 14 days at room temperature without significant loss of potency 1. While refrigeration at 2° to 8°C (36° to 46°F) ensures full potency until the expiration date, temporary storage at room temperature is acceptable within this timeframe.
Evidence-Based Stability Data
Research supports even longer room temperature stability under certain conditions:
- At standard room temperature (20-26°C): Succinylcholine maintains >90% potency for approximately 5 months when protected from light 2
- In emergency vehicles: The drug remains stable for approximately 2-3 months at room temperature 3, 4
- Concentration-dependent degradation: The 20 mg/mL solution degrades at 1.2%/month at room temperature, while the 50 mg/mL solution degrades at 2.1%/month 5
Using the FDA's 10% degradation threshold as the cutoff for acceptable use, the 20 mg/mL solution can be stored at room temperature for approximately 8.3 months, and the 50 mg/mL solution for 4.8 months 5.
Critical Caveats
- Light protection matters: Initial degradation is significantly slowed when solutions are protected from light 2
- pH stability range: Maximum stability occurs at pH 3.75-4.50 6
- Temperature extremes accelerate degradation: At 35°C, 10% potency loss occurs within 1 month; at 70°C, within 1 day 2
- Degradation products present at baseline: Succinyl monocholine and choline breakdown products are detectable even in fresh drug from the manufacturer 4
Practical Recommendations
For routine clinical use: If succinylcholine has been unrefrigerated for ≤14 days, it can be used safely per FDA guidance 1.
For emergency settings (crash carts, ambulances): The drug remains clinically effective for 2-3 months at room temperature, though manufacturer recommendations favor the 14-day limit 3, 4.
After 14 days unrefrigerated: While research suggests longer stability, adherence to FDA labeling (14 days) is recommended for medicolegal protection, unless your institution has validated extended stability protocols.
Document the date when succinylcholine is removed from refrigeration to track the 14-day window accurately.