I've noticed sometimes either my lantus or novarapid Pens stop working as effectively when lowering my sugar levels. It's usually when I'm down to my last packet but there is still alot of time left on the use by date? I throw then insulin out and get new stuff and it fixes the problem. My question is how reliable are the use by dates on insulin and is there another cause of the effectiveness and I'm being psychosymptomatic
Thanks
Thanks