Thanks. I was told they are discontinuing the 0.3 ml u40. I am ordering u100s todayI use ADW for mine so I never have to worry about running out. They do need the initial go-ahead from your vet but after that it's fine. I didn't even have to send in paperwork. When I went to order I simply filled in my vet's information and ADW contacted them for me to get confirmation. My order was processed the next day. After that I actually switched from U40 to U100 to get finer doses and didn't have to update anything at all.