I 100% disagree on this one.
Here in the uk docotrs are not allowed to prescribe by brand name - they have to prescribe by the drug name.
For example when I was presribed anti depressants my gp was not allowed to presribe "prozac" but had to put fluoxetine - which is the drug name marketed as prozac.
The drug name and dosage you are getting is the important factor.
For example with my recent screwed up hormones I was prescribed norethisterone 5mg 3xday.
Norethisterone is often marketed as micronor.
So long as the actual drug and doseage are the same - you get the same level of protection.