hi, treyspot? how long ago did you shoot lantus last?
problem is that lantus lasts about 12-14 hours in most cats, so shooting early intensifies its effect in the system. if you take a look on the lantus forum or in my signature, you'll see a link to the Tilly Protocol, which has been very useful to lantus kitty owners. in a nutshell, under the protocol we shoot the same dose every 12 hours, increasing the dose in tiny increments every 3 to 10 days if we can't get the numbers down decently by nadir, which in most kitties seems to be between 4.5 and 6.5 hours after the shot.
we really need to see how your cat is doing on one dose for about a week to 10 days after he first starts on insulin. does he have any other health issues we should know about, like diabetic ketoacidosis? that would affect how we approach dosing. i'm concerned that multiple shots today have created an overlap situation that may intensify the next shot even further, so at 12 hrs after your previous shot it will be time to shoot again unless his number is too low at that point. after that shot, it would be a good idea to start testing hourly for a few hours to make sure he's okay. if he's running too low, you may need to intercede with food. do you have any canned cat food with gravy that you can get him to lick? some cats will lick that off your finger even if they won't eat normally, and it's what we give them when their numbers are too low.
welcome aboard and hope to hear from you soon re when you last actually injected the lantus into your cat. we'll keep an eye on you two to make sure he's okay.
[ok, based on your discription of his current condition and immediate history, can you make it to the drugstore for some ketone test strips? highly recommend you test for ketones as soon as possible. it involves putting a test strip in the litter right after he pees and before he covers it up, or getting the strip in his urine either collected via ladle or put directly in the urine stream. inappetance and high numbers can lead to ketones, which can be deadly. if we can keep on top of them we'll be ahead of the game.]