Mary, What is your cat's name? I think you forgot to tell us. We would love to know what her name is.
I really wouldn't say the lantus insulin has not worked for your cat. Lantus is a "depot" type insulin, as is levemir. Levemir has a later onset, and a later nadir. Could you tell us when the nadir, or lowest point in the cycle is for your cat now?
It took time for your cat to become diabetic, it will take time to get the diabetes under control.
I think that trying levemir at this point is premature. Plus as you said, rather expensive to do that as an experiment.
There are many members here that use lantus for their cats. We have helped diabetic cat owners get their cats regulated on insulin, including getting over 400 cats diet controlled, otherwise known as in remission or OTJ. OTJ stands for off-the-juice, insulin being the "juice" referred to.
The Friskies pate foods are a good choice for a diabetic cat. Is 6 lbs a good weight for your cat, or should she weigh more or less?
Would you please tell us when you test the BG's (blood glucose) at home? What time of day in relation to the insulin shot? We express times in a + hour format, as we live all over the world.
So AMPS is the morning pre-shot test, PMPS is the evening pre-shot test. +1 is one hour after insulin, +2 is 2 hours after giving insulin, etc.
Was the insulin dose always 1U? Or has that changed over time?
What symptoms did your cat have, that the diabetes diagnosis was based on? Does she still have those symptoms?
I know these are a lot of questions. That you are already overwhelmed with what is going on in the world. But we think we can help guide you and your cat in this diabetes journey. Hope you will reply soon.
Take good care of yourself, and keep safe in these difficult times. That is very important to do, especially now.
Do you live in the US or Canada, or elsewhere in the world?
Many people that live in the US purchase their insulin in Canada, from Marks Marine Pharmacy. They carry levemir as well as lantus.
Here is the thread with information that talks about that.>>>>>
Ordering Lantus, Basaglar, or Levemir from Canadian pharmacies
There is also a member, Alan Hamman that often has lantus, levemir and other insulins for offer in our Supply Closet. He is reliable and trustworthy from what I understand from other people. Here is the link to his thread >>>>>
Levemir pens
You will need to PM him, or what is also known as "Start a New Conversation." Do you know how to do that?