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When I went to TID dosing -- I started by splitting the total daily insulin (for Tommy 2.5 +2.5 = 5 u ) and divided into 3 equal shots.
since 5/3 is kind of hard to do -- I would go with 1.5u TID
Start on a day that you will be home -- as high as Tommy has been -- give 2.5u in the morning as usual.
At +8, test his BG. If over 200, then shoot 1.5u and continue on from there with tests, meals and shots every 8 hours. (you can make the meals a bit smaller to give 3 also -- with N, it is important to feed when they get the shot and they need to eat about a spoonful ~1oz)
I would suggest that you call BCP Vet Pharmacy about shipping PZI. I don't know of any changes that restrict the shipment -- however shipping costs are significant -- maybe your vet had some problems getting it or just didn't like the cost.
www.bcpvetpharm.com
Toll Free: 800-481-1729
Toll Free Fax: 866-PET-CHEW -- you do need to fax a prescription -- and ask that it be written for a year's supply (several bottles -- you can choose U40, U50 or U100 strengths in either 5ml or 10ml vials)
U40 is popular for giving tiny doses using U100 syringes (U40 is dilute so 1u fills a U100 syringe to the 2.5 mark)
U100 is the same concentration as Humulin N
It would be good to check for infections -- they can aggravate blood sugar.
Check out the new vet. Most do not know about using Levemir.
There are a number of articles about FD / Lantus published.
print out the info here --- and the 3 main reasons that I prefer Levemir to Lantus:
1. Levemir and Lantus are both gentle long-lasting insulins good for cats with BID and low carb diet.
2. Lantus has an acidic base liquid and stings when injected. Levemir does not - it has a neutral base.
3. Lantus is fragile and breaks down after 5-6 weeks -- requiring that you discard and start a new cartridge. Levemir is not as fragile, and I've been able to use the entire 3ml cartridge -- never had to throw away any from loss of effectiveness (using Levemir since 4/2009.