Hi, My Kitty, Murphy was originally diagnosed with Diabetes in October of 2009. After only about 6 weeks on Lantus he went in to remission. However, in August of 2010 the Diabetes came back. He was put back on Lantus and now it is a little over 5 months and he is still on Lantus. His dosage is one unit twice daily. My main concern is that his Vet told me that the Lantus is good for Cats for 3 months as opposed to the normal length of time which is 28 days. I've noticed that his numbers start to creep up after about 2 months. I've decided that I am going to tell his Vet that I want a new Prescription every month. Any suggestions where I can purchase a vial of Lantus at a lower cost than the $126.00 that I'm now paying? I've heard that Walmart Pharmacies are less expensive???? Does PetMeds carry Insulin? Thanks so much!!!!