I don't work with the public anymore, so that part of my experience is gone.

But I do look up stuff on FDA.gov-- the Orange Book will show
who makes the generics (if they are available).

http://www.accessdata.fda.gov/script...cs/queryai.cfm

type in duloxetine to the ingredient field.

In the past many generics at first were made by the parent company. An example was Greenstone owned by Pfizer. But that seems less common today..with the huge competition by foreign countries for a slice of the $$ pie of Big Pharma.

For duloxetine there are many companies, listed there.
So one would have to have experience with patients who come back and complain and their particular generic. Large chain pharmacies buy in bulk and often get "deals" from specific companies, so you could get one generic at Walgreens and another one at WalMart, for example.

I'd ask a few pharmacists their advice. They may be honest or refuse to give a straight answer...as that is how the party line has become in pharmacy.

You could try searching each company online--
"complaints duloxetine generic Teva" and vary the name for each search. It is a long list I see this morning at the Orange Book. Some of them are Indian... and for example, I didn't like Lupin myself for my past blood pressure pill. I had Watson ordered for myself back then. If you find a brand that doesn't have the complaints, you can try to have the store special order it for you if they don't normally carry it. Today I am using a Zydus product with no problems. Zydus is listed for duloxetine as well.