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Supplemental Techniques in Regulating Your Diabetic Cat 
(Beyond Twice-a-day Fixed Dosing)
Developed by the Feline Diabetes Message Board community
written by Janet & Binky

Why supplemental techniques are used

The Start Low Go Slow (SLGS) methods described in Susan & Shadow's 5 Steps To Regulation doesn't bring all cats into regulation.  If you have been using this method as described, but are not satisfied with your progress toward regulation, or if your cat is reasonably regulated but you would like to improve his glucose values, it may be time to consider adding new techniques to your toolbox. 

This document outlines some techniques that are used to attain these goals.

Before you commit to trying this, please review 5 Steps To Regulation, and make sure you have been following the "Start Low Go Slow" (SLGS) program as described in this document.   If you have not been running a curve every week or so and adjusting the dose based on the low value of the curve, it's possible that you haven't given the method a fair chance, or that you haven't found the right dose for your cat.  But if you've given it a good try and you're getting inconsistent results or too-high blood glucose, some change to the standard protocol may be helpful for you.

Before you begin

Review: How diet affects regulation

What and how you feed your cat are very important to the process of regulation.  Some important dietary principles are:

Regulation.  Regulation in cats is differently defined by different authorities, and the definition is evolving as the standard of treatment changes.  Here is one possible set of definitions (from the FDMB FAQ):
Aggressive dosing.  Any dosing protocol which involves increasing the risk of hypoglycemia.  (Note: there may be good reasons for taking that risk, including avoiding diabetic ketoacidosis and other complications of chronic high glucose values.)

Tight regulation
.  Keeping glucose as close to euglycemic (70-100 mg/dl or 4-5.6 mmol/L) as possible for as long as possible, and under 150-200 mg/dl (8.3-11.1 mmol/L) almost all of the time. This is a result, not a method in itself.   This is a desirable goal for the good health of the cat, and the main obstacle to achieving it is the risk of hypoglycemia.  A second obstacle is inconsistent response to a specific dose of insulin.
Tight regulation method. Any non-SLGS method which has, as its aim, to keep a cat tightly regulated.   (Note: the method may not succeed in its aim, and other methods might lead to tight regulation; the issue is the intent of the person using the method.)

TID or QID dosing
What it is:  Giving insulin three (TID) or four (QID) times a day, usually regularly spaced.
Purpose: To create a smoother glucose curve with less distance between the pre-shot value and the glucose nadir (low point).
Who might use it: Cats who have a wide range of blood glucose values even on a very gentle insulin.
Advantages: Keeps glucose levels more stable over the course of the day.
Disadvantages: Labor intensive, requires frequent testing, more restrictive to your schedule than BID dosing, more expensive due to increased use of syringes and test strips.
As-needed dosing
What it is: Giving insulin when the cat's blood glucose goes above a certain amount after the previous dose has peaked and the blood glucose is clearly increasing, typically somewhere between 150 and 200 mg/dl (8.3-11.1 mmol/L), without regard to the clock.
Purpose:  To keep glucose levels consistently in desirable ranges.
Who might use it: Cats who do not have a consistent response to insulin, and people who are attempting to achieve tight regulation with their cat.
Advantages:  When the cat cooperates, blood glucose levels are kept in or near euglycemic ranges.  A little more flexible than TID or QID dosing.
Disadvantages:  Requires frequent testing both to determine when the previous dose of insulin is past peak, and when the blood glucose rises enough to require a new dose.  May cause confusion if the previous dose did not lead to a clear glucose nadir.  Potentially expensive due to increased use of test strips.
Bolus (booster) dosing.
What it is:  Giving small doses of fast-acting insulin (Humulin R, 70/30, or N), as an adjunct to the usual dose of long-lasting insulin (PZI, Lantus, or Levemir).
Purpose:  To promote a rapid drop in blood glucose over a short period of time.
Who might use it:  Cats who tend to have food spikes;  cats who tend to have too-slow response to their long-lasting insulin; cats who occasionally don't seem to respond to their usual insulin; cats who are prone to adverse complications of high glucose, particularly ketones; cats who have a difficult time coming down from high numbers.
Advantages:  Helps handle high glucose values swiftly and usually predictably.
Disadvantages: Requires keeping extra insulin around, may require extra syringes; frequent testing needed; risk of hypoglycemia if too much is given; may inadvertently be used when the real solution to the problem is to increase the dose of the cat's usual insulin. 
More expensive due to increased use of syringes and test strips.
Comment: Can be given with the regular shot, or between shots.  Can be given regularly or on an as-needed basis.  Dose can be varied according to blood glucose level.
Warning 1:  In some cats,  1 unit of a fast-acting insulin can quickly drop their blood glucose by hundreds of points in a short period of time.  It is crucial to start with miniscule doses and assess the action of the insulin by testing every hour until you have data on how much insulin you can safely give.  This is a very dangerous technique if not properly used.  Treat the fast-acting insulins with respect!
Warning 2:   If your cat has diabetic ketoacidosis, she belongs in the care of a vet.  DKA requires  making sure electrolyte levels are balanced before giving insulin.  Do not attempt to treat DKA at home.
Sliding scale dosing.
What it is: Basing the insulin dose on the pre-shot value -- less insulin if the pre-shot is lower, more insulin if the pre-shot is higher.
Purpose:  With usual insulin, to reduce the risk of hypoglycemia if the cat has an unusually low pre-shot glucose value.  With bolus doses, to handle unusually high pre-shot values.
Who might use it:  Any cat who has a low pre-shot number; users of the Dr. Hodgkins protocol; users of boosters (with the booster insulin).
Advantages:  Avoids hypoglycemia.
Disadvantages:  Reduced dose may lead to high pre-shot in next cycle for those dosing by the clock, or short duration for those using as-needed dosing. 
Comment:  Primary variations are: a.) having a standard dose for the cat, but giving less insulin if the pre-shot is unexpectedly low, and b.) varying the dose from one shot to the next as a general practice. 
Use of sliding scales may not be necessary with very slow-onset insulins, but that should be determined with data from your own cat, assuming that a reduced dose is necessary unless you collect clear evidence that it is not.
Varying needle length
Comment:  Needles are typically available in 1/2-inch and 5/16-inch lengths.  For some cats, needle length has been shown to make a difference in onset and duration of insulin, possibly because the probability of inadvertently shooting into the fat layer is different.
Varying injection site
Comment:  Onset, action, and duration of insulin may be different if the injection is done at different sites.  If inconsistency is a problem, you can try experimenting with injections between the shoulderblades, between the thigh and the side of the body, or at the abdomen.  Do not inject into muscle: insulin injections must be subcutaneous.   Injecting at the scruff of the neck is thought to lead to inconsistent absorption. 

For more information on feline diabetes, check out Dr. Rebecca Price's ( and the FDMB Frequently Asked Questions List (

Version 1.15, August 20, 2006.