That would depend on the pharmacy/pharmacist.  In chains, most of the
purchasing decisions are made above the store level, and are based mainly on
cost.  We can order a specific brand from our wholesaler, get charged more
than our warehouse brand, have multiple brands on the shelf, forget which
patient wants which brand, get confused, piss people off, get frustrated.
Most of the pharmacists in my area will not stock a specific brand for a
patient.  You would probably have better luck with an independent pharmacy.
Just keep in mind that there is no rule that they have to and you will get a
better response by asking nicely. (It's sad I have to add that, but I've
dealt with too many people this week who think that bullying is a way to get
good customer service.)

Very True.... BUT as someone else stated you end up with multiply
Generic brands of the same drug on the shelf which normally is not a
problem IF only 1 or 2 Individuals want a specific Manufacturers
product. ..

BUT

The major reason I WILL NOT stock specific manufacturers is simple...

IF the patient IS NOT A CASH CUSTOMER... I normally will loose money
or at best cover my costs...  A Cash customer on the other hand is
charged my true costs plus a normal markup...    

Insurance Companies set the maximum they will pay for any multisource
product .  and the Pharmacies all scramble to find "deals" on buying
these multisource products at or less then the maximum Insurance
Companies pay...    

From my experience 90 percent of the Pharmacists behind the counter of
chain stores (and I was a chain store manager for 30 years) have
absolutely no clue  on what they actually paid for a drug and how much
they are selling it to an insurance company for...  moswt assume that
actually make money filling every Rx...  LOL  I wish !

Bob G