I have a CRF cat who gets 150-200 Sub-Q\'s every day or every other day, depending on her fluid level. She also gets hypercalcemia, but the Sub-Q\'s seem to take care of this. Since Renal Failure eventually means my precious cat will be leaving us, a friend gave me left-over Buprinex that her Vet gave for her cat who had a surgery, but recovered quickly and didn\'t use all of the Buprinex. I\'m just wondering what the shelf life of Buprinex is in case Autumn, my beloved cat, gets to that point where she\'s starting to feel pain so I can administer it to her every 12 hours. (I\'m Red-Cross certified in Dog & Cat First Aid, but that\'s mostly for things like CPR, Seizures, choking - doesn\'t really cover the things my special needs cats have, i.e., CRF, I have a hyperthyroid cat, Radial Hypoplasia guy, upper eyelid agenesis girl who had her surgery, but still has some scarring \'cause I wasn\'t able to foster her until she was 5 months old - someone else was and wouldn\'t give her up or get her to the surgeon before the damage was done). Anyways, in short, what is the shelf life of Buprenex? I know that some medicines become stronger after expiry and some don\'t - I would adjust accordingly when that time comes. p.s. I am not a drug user. I am an animal advocate and take in the cats with special needs.