shelf life of N liquid (when the bottle is opened and the seal broken) ?

[Alucard]

If the N is in the fridge, but open and with broken seals, how long can it be used safely ?

I ask the question because to test it, you have to open it...

 

[ImsooDone1N]

The liquid N (Pisabental) comes in a 100ml glass vial With a flip off top & typical rubber stopper and metal clamp seal. You could (assuming you have a syringe) simply remove the flip off top, withdraw say, 1ml for testing and the seal and stopper would still be in place. Yes you would have punctured the rubber stopper, but Those are multi dose vials & the rubber stopper reseals after a syringe is inserted & withdrawn.
However if you completely remove the seal & rubber... the shelf life will be significantly decreased as oxygen get to the pentobarbital. I can't say for certain, but you would be decreasing the shelf life from Several years to perhaps 30 days.

 

[Alucard]

Thank you very much for your detailed answer.

If, on the contrary, the seal has been broken without drilling the rubber, is the life of the N also reduced to 30 days?

 

[Not_Quite_Dead_Yet]

. Yes you would have punctured the rubber stopper, but Those are multi dose vials & the rubber stopper reseals after a syringe is inserted & withdrawn.

Thanks for that tip! I had no idea the rubber stopper reseals itself.