I've seen some people post that they change their pens after the first month, and others to the last drop so I wanted to be sure.
Nope, I don't use the FB page. I definitely saw it here but it's very possible they were older posts. I saw it mentioned a few times back when I was first researching Lantus pens, sometimes I find really old threads. Good to know that's not the standard because I thought that was a fairly short lifespan too.I'm not sure where/who posted that they change after a month - but generally around here everyone keeps their insulin in the refrigerator and uses it until the last drop.
Is it possible you read that on the FDMB sister page on FB?