I've not used Lantus..
But a lot of users to complain about stinging when injecting, as it's got a slightly acidic ph balance than Levimer... The profiles are slightly different in the two which suggests that Lantus has a flater profile, but in practice levimer tends to give a flater one.. Levimer also lends itself to splitting than Lantus does.. Another problem which isn't really excepted by the HCP, is that a lot of users seem to experince several side effetcs, such as foggy headness, joint pains, unperdictable hypo's, after they've been using it for several years! Oh and has a bad rep for weight gain!
Strange you say about headache's..
I'm on a pump now, but did use levimer when I swapped to it, I started to get painless migraines, get the visual disruption with flashing coloured lights in my vision, similar time I started to sleeping though nightime hypo's so when I woke up in the morning my eyes were blizted, it was like looking through a very thick dirty net curtain :shock:
When I went to my doctors and discribed these two symptoms, he had me straight over to the emergency eye clinic, as apparently these symptoms presented when the retina is starting to detach! But a full check by the eye specailist nothing found and declared I was having painless migraines! Funny though I used to get this 4-5 times or more a month while I was using levimer, but in over 3 years of pumping, I've had 3 or 4 attacts in total..