I use the lantus solstar pen as well as the novo Nordisk novolog pen and I was always told that leaving the needles on, can not only cause the needle to bend. In some cases this can cause the full dose not to be delivered. Also leaving the needle on causes an open path whereby you could actually waste more insulin. I may be off but, aren’t needles cheaper than insulin? Not to mention the additional increased risk for scar tissue forming by reusing needles? IMHO don’t reuse needles lancet may be one thing but, needles are a whole other ball of wax.
