The metacam was most likely prescribed to reduce the pain he was in during the urinary tract infection. Were you dispensed a whole container box included from the veterinarian or did they pour some in a separate bottle. If it was poured in a separate bottle the label in the computer may not have been changed to the correct date. If you suspect it is expired take it back and get a new bottle. It won't hurt, but it may not be as effective as one that is current. Continuing the prescribed diet and not offering treats or other types of food will help to keep the crystals from reforming. Make sure after he has completed this round of antibiotics that he has his urine rechecked as sometimes they need two rounds to clear everything. There are also oral medication that you can choose to use if the food is not working out.
Good Luck
Theresa
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