Half units with Tresiba pen

Hi, I wanted to ask you, we have now changed to Tresiba and well the problem we have is that with 16 we are short and with 17 we spend then they have told me that there is a possibility of putting half units you know some how this is done thanks thanks

I don't know if there are half -unit feathers of Tresiba, but one possibility is to put it with syringe and roads ..

Thank you