So my kit was a victim of divorce. He went downhill and my glorious ex didn’t take him in to the vet or let me know. When I saw him I rushed him in with extreme weight loss and neuropathy. After 5 months we’ve been in remission for 3 months. I have 1 full and one 1/4 full vial of prozinc. Should hang on to it? Sell it? Toss it? Expiration is 5/20. What are the chances he will come out of remission? New at all this!