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However the switch is a pretty complicated one. I would suggest that it be accomplished with your Dr. but the Vol is wrong in that Lantus does not have a peak. It does have a peak at about 4-6 hours but it is not a large peak. This peak does effect many users in the middle of the night.
The easiest suggestion is to make sure that you test at dinner. You really need to be doing this regardless of whether you are on Lantus or not. Skipping doses is has a really bad effect on your levels as you will tend to over compensate at bedtime for what you missed at dinner and had several hours of highs in between. Giving you a yo-yo effect in your sugars.
Also, if you are taking Lantus and bolus at night before bed because you missed your dinner then you are in fact taking a double dose of insulin and they are kicking in at peak near the same times. Your bolus will peak a couple hours after bedtime and then your levels will be correct and then your Lantus will be peaking right after that. This is why you are getting lows. Additionally, you should NOT be mixing the two Insulins in the same syringe.
I believe that the switch from evening Lantus to moring Lantus is generally made in the following manner but you should REALLY see a Dr. to do it correctly. Generally I think they change it over a long period of time by taking 1 less unit at night and then taking 1 unit in the morning and the following day take 1 less unit at night and 2 in the morning etc. I have never done the switch so I am not the best person to advise on it but that is what I understand. With some people just taking a few units in the morning is enough to even it out but in my opinion that defeats the purpose of 1 shot a day !!! If I were to switch I would ask my Dr. if I could skip 1 dose of Lantus and just start on a new schedule. In other words I would skip 1 evening dose and not take another dose until the following morning 36 hours later. This would seem to be the easiest to me but you would have to bolus a lot that one day to compensate. Like I said see the Dr. this can be really complicated.
Long answer to a short question. Hope it helps some.
And yes, I agree that there is a peak in the action of Lantus somewhere between 4-5 hours, usually. Some people notice it more than others. I notice it a great deal and have to feed it when it happens. But it still is much better than the old NPH insulin with its horrible peak actions that could get dangerous.
As for the other, I wouldn't change it without professional advice, I just wanted to know if it'd been done and how.
So thank you very much for your insight. I appreciate your thoroughness!