Bad Insulin Pen

I had another Humalog insulin pen go bad on me yesterday. The dosage selector would stop working so I cannot use the remaining insulin still left in the pen. This is the third or fourth pen from Eli Lilly that has failed before all the insulin is used up.

You can see I still have nearly half the insulin left in the pen. The dosage knob also shows there are at least 60+ units remaining. A box of five pens costs about $2,000 so each pen is $400. Since I am unable to move the knob and plunger on the above pen, I had to throw it away with $150-$200 of insulin still left inside.

In comparison, I also use a long-lasting insulin from another company. The pen is a bit longer but feels more solid, and I have never had an issue with insulin injection using that pen.