In my personal experience it isn't the doctor that drives changes in my prescriptions, but my insurance company. If Elite has a cheaper product insurance companies will contact doctors and ask if they can switch to the cheaper drug. In the network world of insurance I live in its as important for doctors to keep insurance companies happy as it is patients. I have a fixed cost mail order type coverage with three or 4 tiers depending on the cost of the drug. No matter the drug's cost I pay the same so if the insurance can pay less they save $$, they increase their profit.
I agree, I'm sure there are other reasons that we haven't even thought of for why they went with the IR rather than ER, as I said before I have faith in Nasarat, as I am certain they have a strategic plan in place for how and when they will push each drug through C/Trials granted they are successful with the current P3.