PZI expire date

[Olivia and Coconut]

Coconut and I have been using PZI VET successfully since he was diagnosed in 9/08. The last bottle I was able to get and have been using has an expire date of 5/10. It was the only bottle my vet had at the time. I know from expeirence that PZI is good to the last drop. But is it good past the expiration date. It looks good and he does too. How long do you think I can use it safely?
Thanks for any and all thoughts.
Olivia

 

[LynnLee + Mousie]

i used it for several months after the expiration date. no matter what though, when it comes to insulin & it's efficacy, if you are hometesting you can tell when it poops out based on the numbers you start getting.