When I was on MDI, this would sometimes happen. It’s because the injection hit a blood vesicle an the pressure of the blood backs into the pen while you’re holding it for the couple of seconds to make sure you get the full dose. I can’t really say, that you suppose to or or not suppose to keep using the insulin; but I did, and I’m still alive and well.
If you ever had an IV, this is similar to when the blood backs into the IV infusion set and tubing.
Thanks
Given your comment I will use it for a couple of days because I just oppened it but I will throw it earlier than I would normally out of precaution.
Thanks so much
I personally would not use it. I use a pen currently and if this happened to me I would toss it. I would think it would be a possible medium for bacteria to enter and contaminate the insulin. Just my opinion, though.
I’ve not had it happen as yet on any of the pens I use (Lantus and humalog) but if it did happen I’d likely call the pharmacy and ask about it and go on from there.