Hi
@rachy0121, Yes, I have forgotten my doses before breakfast in the past and double dosed myself in the evening - so you are in good company. Besides how else do we learn except from making mistakes?
From my past experience as T1D, not as professional advice or opinion: I have never used
Lantus and some have had problems with it regarding absorption, and rarely, from hypos if accidentally injected into a blood vessel.
And even if it it is not lasting 24 hours there is a concern, at least in theory, that if used every 12 hours the overlap could be a problem.
As an example, say the Lantus last 18 hours, if given every 12 hours, there would be an overlap of first and second doses at the 12 to 18 hours mark after the first dose dose. The overlap is called
insulin on board or insulin stacking. This term is mainly used where short acting insulin (? what is yours?) overlaps in its action with another dose of short acting and risks hypos occurring. So twice daily Lantus may work if the overlap is not too great and is timed well but otherwise might be a problem.
Consider say the first dose of lantus at 10 pm and the next at say 8 am the next morning, based on a 18 hour action. the overlap is from
8 am the next morning to 4 pm. With the next pm dose of lantus at 10 pm the next night the overlap is from
10 pm til 2am. So hypos might be more likely based on this at say halfway in overlap onwards so ?1pm to 4 pm and 12mn to 2 am.
I and others have also noted that the insulin we take works better, dose for carbs eaten, in the evening compared to the morning. So if more 'umph' is needed say in the morning we might take more short-acting insulin for the number of carbs at breakfast than in the evening. The overlap of lantus in the morning (8am to 4 pm) might helpa little the after breakfast BSL reading to be lower but ? hypo later. Similarly a risk of hypo at 12 to 2 am is not something to wish for !!
So perhaps talk with your DN about what you are doing with your Lantus.
Have you wondered
if the high BSLs could be due to something other than the Lantus insulin dosage etc?
Could the highs be due to diet or associated with stressful time of day? And we have already noted that some of us need more short-acting insulin before breakfast. Others also find that their BSL has already started to rise before they wake up.
Also by testing BSLs some find that their short-acting insulin takes longer to 'kick in' than others.
Take Novorapid for example: its peak of action (ability to lower BSLs) is max at say 2 to 3 hours and overall effect may last 5 to ?7 to 8 hours. Lots of variation there. So some of us find that taking Novorapid just before breakfast allows the BSL peak from breakfast to beat the Novorapid peak effect. To better match the rising BSL to the peak in Novorapid effect some delay breakfast for say 3/4 to one hour after the Novorapid is given and obtain a better 2 hours after meal BSL result.
For others the Novorapid taken just before breakfast works fine.
Again some thoughts to share with your DN to help sort things out.
Please keep posting about how things go!!