Ok here we go again... My 11 yr old male cat has reached the end of the Vestsulin bottle (which he has tolerated very well) and now my vet has prescribed Humulin NPH. I am not comfortable with this and have an appointment this pm to see about getting a prescription for PZI. I think he'll do this as he has seen a dramatic change - reduced insulin amount and overall health - in my cat since switching to canned food. My question is where should I direct my vet to send the prescription for PZI (company information). If he doesn't agree to the prescription then what is the insulin dosage for Humulin NPH? Your reply is very much anticipated!!