I'm sure I read something a pen only lasting a month in terms of the medication then 'going out of date'. I'm due to do my 4th jab on weds and may even try the golden dose the week after. However, Oushk, who I'm with, have got a discount code until 23rd so I thought about ordering my 5mg pen now to get the discount. Is that OK though if I don't actually start using it for potentially a couple of weeks?