Questions like these are very difficult to pin down because every doctor is going to have his own reason. One thing could simply be that a drug rep came in and advertised their drug well so he uses it now. Or a doctor may think a certain name brand only medication has less side effects and better effectiveness than another drug that has a generic. Those are probably two biggest reasons I can think of off top of my head.
__________________ ---I answer questions to the best of my ability, but with always limited knowledge of the patient's situation and obviously I can not see your chart or full medical history my advice is limited and should also be confirmed with your own doctor/pharmacist/etc. and I do not promote following my advice without proper approval from your doctor either--
Dr. B  | 
Name brand or generic? Why? 
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