There are certain medications that are just expensive, unfortunately (based on nothing, really). I had Latuda prescribed for me and there was literally no option to get it cheaply.
If I understand correctly, in this case, IF your insurance will cover it YET the copay is UP TO $400, THEN the manufacturer will give you a coupon to pay as little as $25.
I did some research on this. I believe the key is getting your insurance to cover it (even if it is still a high copay). Then, after that, you can use the manufacturer coupon card. I hope this helps somewhat.
Getting your insurance to cover it (this might be having your doctor call them, appealing it if they deny it, etc.) might be the hardest part.